Question 1: Palette 1/194

Allen 1953 MCQ

The Watson-Crick model of DNA double helix was proposed in :-

A

1953

B

1963

C

1954

D

1952

Question 2: Palette 2/194

Allen MCQ

The most abundant intracellular cation is :

A

K⁺

B

Na⁺

C

Ca⁺⁺

D

H⁺

Question 3: Palette 3/194

Allen MCQ

Codiene is :-

A

A polymeric substance

B

An alkaloid

C

An essential oil

D

A toxin

Question 4: Palette 4/194

Allen MCQ

Which is odd –

A

Chitin – Carbohydrate

B

Pectin - Protein

C

Steroid – Lipid

D

Wax – Lipid

Question 5: Palette 5/194

Allen MCQ

Which is a disaccharide?

A

Galactose

B

Fructose

C

Maltose

D

Dextrin

Question 6: Palette 6/194

Allen MCQ

Sugar found in haemolymph of insects is called-

A

Maltose

B

Lactose

C

Trehalose

D

Galactose

Question 7: Palette 7/194

Allen MCQ

Carbohydrates are stored in mammals as:

A

Glucose in liver

B

Glycogen in muscles and spleen

C

Lactic acid in muscles

D

Glycogen in liver and muscles

Question 8: Palette 8/194

Allen MCQ

Translocation of sugars in flowering plants occur in the form of -

A

Glucose

B

Sucrose

C

Fructose

D

Maltose

Question 9: Palette 9/194

Allen MCQ

Sucrose is composed of -

A

Glucose & Fructose

B

Glucose & Glycogen

C

Two molecules of Glucose

D

Glycogen & Fructose

Question 10: Palette 10/194

Allen MCQ

Sugars with five membered ring are called:-

A

Pyranose

B

Furanose

C

Dextrorotatory

D

Levorotatory

Question 11: Palette 11/194

Allen MCQ

Amylose and Amylopectin chains occur in-

A

Glycogen

B

Starch

C

Cellulose

D

Chitin

Question 12: Palette 12/194

Allen MCQ

Which of the following disaccharide gives two molecules of glucose on hydrolysis?

A

Maltose

B

Lactose

C

Both (1) and (2)

D

Sucrose

Question 13: Palette 13/194

Allen MCQ

Which monosaccharide does not show optical isomerism :

A

Dihydroxy acetone

B

Glyceraldehyde

C

Erythrose

D

Ribose

Question 14: Palette 14/194

Allen MCQ

Which one of the following sets of monosaccharides forms sucrose? Yes. I can format the options exactly like this:

A

β-D-Glucopyranose and
α-D-fructofuranose

B

α-D-Glucopyranose and
β-D-fructopyranose

C

α-D-Galactopyranose and
α-D-Glucopyranose

D

α-D-Glucopyranose and
β-D-fructofuranose

Question 15: Palette 15/194

Allen MCQ

Macro molecule chitin is :

A

Simple polysaccharide

B

Nitrogen containing polysaccharide

C

Phosphorus containing polysaccharide

D

Sulphur containing polysaccharide

Question 16: Palette 16/194

Allen MCQ

All lipids are -

A

Composed of fatty acids

B

Triglycerides

C

Insoluble in water

D

All the above

Question 17: Palette 17/194

Allen MCQ

Which one of the following is not a constituent of cell membrane ?

A

Phospholipids

B

Cholesterol

C

Glycolipids

D

Proline

Question 18: Palette 18/194

Allen MCQ

Proteins present in protoplasm are very important because-

A

They provide definite shape to cell

B

They function as biocatalyst

C

They yield energy

D

They are stored food

Question 19: Palette 19/194

Allen MCQ

Unit of protein is: -

A

Amino acid

B

Monosaccharide

C

$NH_3$

D

Nucleotide

Question 20: Palette 20/194

Allen MCQ

Milk protein is-

A

Lactogen

B

Myosin

C

Casein

D

Pepsin

Question 21: Palette 21/194

Allen MCQ

The amino acids which are not synthesized in the body are called:

A

Non-essential

B

Essential

C

Deaminated

D

All of them

Question 22: Palette 22/194

Allen MCQ

For body growth and repair, one needs:

A

Carbohydrates

B

Fats

C

Proteins

D

Vitamins

Question 23: Palette 23/194

Allen MCQ

Proteins in the body are composed of: -

A

Amino acids

B

Natural proteins

C

Enzymes

D

nucleic acids

Question 24: Palette 24/194

Allen MCQ

Which is most important structural part of the body?

A

Protein

B

Carbohydrates

C

Lipid

D

Nucleic acid

Question 25: Palette 25/194

Allen MCQ

Histone is a basic protein due to -

A

Alanine & glycine

B

Methionine & serine

C

Tryptophan & tyrosine

D

Lysine & Arginine

Question 26: Palette 26/194

Allen MCQ

Which one is the most abundant protein in the animal world ?

A

Collagen

B

Insulin

C

Trypsin

D

Haemoglobin

Question 27: Palette 27/194

Allen MCQ

Nucleic acids are made up of -

A

Amino acids

B

Pentose sugars

C

Glycerol

D

Nucleotides

Question 28: Palette 28/194

Allen MCQ

Circular and double stranded DNA occurs in

A

Golgi body

B

Mitochondria

C

Nucleus

D

ER

Question 29: Palette 29/194

Allen MCQ

Double helix model of DNA was proposed by-

A

Watson and Crick

B

Schleiden and Schwann

C

Singer and Nicolson

D

Kornberg and Khorana

Question 30: Palette 30/194

Allen MCQ

Back bone in structure of DNA molecule is made up of -

A

Pentose Sugar and phosphate

B

Hexose sugar and phosphate

C

Purine and pyrimidine

D

Sugar and phosphate

Question 31: Palette 31/194

Allen MCQ

Nucleotide is -

A

N-base, pentose sugar and phosphoric acid

B

Nitrogen, Hexose sugar and phosphoric acid

C

Nitrogen base, pentose sugar

D

Nitrogen base, trioses and phosphoric acid

Question 32: Palette 32/194

Allen MCQ

Which element is not found in nitrogenous base?

A

Nitrogen

B

Hydrogen

C

Carbon

D

Phosphorus

Question 33: Palette 33/194

Allen MCQ

A N-base together with pentose sugar and phosphate forms: -

A

Nucleoside

B

Polypeptide

C

Nucleotide

D

Amino acid

Question 34: Palette 34/194

Allen MCQ

The purine & pyrimidine pairs of complementary strands of DNA are held together by –

A

H – bonds

B

O – bonds

C

C – bonds

D

N – bonds

Question 35: Palette 35/194

Allen MCQ

On an average, how many purine N bases are present in single coil of DNA?

A

Four

B

Five

C

Ten

D

Uncertain

Question 36: Palette 36/194

Allen MCQ

ATP is-

A

Nucleotide

B

Nucleoside

C

Nucleic acid

D

Vitamin

Question 37: Palette 37/194

Allen MCQ

In DNA, purine nitrogen bases are: -

A

Uracil and Guanine

B

Guanine and Adenine

C

Adenine and cytosine

D

None

Question 38: Palette 38/194

Allen MCQ

Adenylic acid is: -

A

Ribose + Adenine + phosphate

B

Ribose + cytosine

C

Nucleoside

D

Deoxyribonucleotide

Question 39: Palette 39/194

Allen MCQ

The fastest acting enzyme, in the biological kingdom among the following is:

A

Lipase

B

Amylase

C

Peptidase

D

Carbonic anhydrase

Question 40: Palette 40/194

Allen MCQ

Apoenzyme is:

A

Protein

B

Vitamin

C

Carbohydrate

D

Amino acid

Question 41: Palette 41/194

Allen MCQ

Which of the following inactivates the enzyme by changing its shape?

A

Competitive inhibitor

B

Allosteric inhibitor

C

Coenzyme

D

All of the above

Question 42: Palette 42/194

Allen MCQ

Enzyme were discovered for the first time in:-

A

Bacteria

B

Yeast

C

Algae

D

Spinach

Question 43: Palette 43/194

Allen MCQ

What is NADP?

A

An enzyme

B

An ion carrier

C

H acceptor coenzyme

D

A part of t-RNA

Question 44: Palette 44/194

Allen MCQ

The cofactor of various respiratory enzymes is: -

A

Ca

B

B

C

Mg

D

Mo

Question 45: Palette 45/194

Allen MCQ

Most enzymes consist of two parts these are :-

A

Enzyme & substrate

B

Enzyme & coenzyme

C

Apoenzyme and enzyme

D

Apoenzyme & cofactor

Question 46: Palette 46/194

Allen MCQ

The first enzyme isolated in crystalline form was :-

A

Catalase

B

Urease

C

Peroxidase

D

Amylase

Question 47: Palette 47/194

Allen MCQ

In plants, enzymes are present: -

A

Only in flowers

B

Only in leaves

C

In all the living cells

D

Only in parenchyma

Question 48: Palette 48/194

Allen MCQ

Enzyme inhibition caused by a substrate analogue is :-

A

Competitive

B

Non-competitive

C

In competitive

D

Semi-competitive

Question 49: Palette 49/194

Allen MCQ

Allosteric enzymes have allosteric sites for :

A

Inhibition only

B

Activation only

C

Reduction in activation energy

D

Both activation and inhibition

Question 50: Palette 50/194

Allen MCQ

An example of competitive inhibition is :

A

Succinic dehydrogenase by malonic acid

B

Cytochrome oxidase by cyanide

C

Hexokinase by glucose - 6 phosphate

D

Carbonic anhydrase by carbon - dioxide

Question 51: Palette 51/194

Allen MCQ

First discovered Enzyme was :-

A

Isomerase

B

Transaminase

C

Zymase

D

Transferase

Question 52: Palette 52/194

Allen MCQ

Enzyme were discovered for the first time by:

A

Sumner

B

Buchner

C

Kuhne

D

None of the above

Question 53: Palette 53/194

Allen MCQ

Who coined the term enzyme ?

A

Pasteur

B

Buchner

C

Kuhne

D

Sumner

Question 54: Palette 54/194

Allen MCQ

Vitamin serves the function of :-

A

An enzyme

B

A coenzyme

C

A holoenzyme

D

A hormone

Question 55: Palette 55/194

Allen MCQ

Which of the following is a coenzyme ?

A

NAD

B

NADP

C

FAD

D

All the above

Question 56: Palette 56/194

Allen MCQ

The Coenzyme is -

A

often a metal

B

often a vitamin

C

always a protein

D

always an inorganic compound B

Question 57: Palette 57/194

Allen MCQ

Which of the following is produced with the combination of apoenzyme and coenzyme-

A

ES complex

B

Prosthetic gp

C

Holoenzyme

D

EP complex’s

Question 58: Palette 58/194

Allen MCQ

Which of the following coenzyme is a derivative of Niacin ?

A

NAD

B

NADP

C

FAD

D

Both (1) and (2)

Question 59: Palette 59/194

Allen MCQ

Which of the following is not consumed in a biochemical process ?

A

Hormones

B

Enzymes

C

Vitamins

D

Nucleotides

Question 60: Palette 60/194

Allen MCQ

How the presence of an enzyme affects the activation energy of a reaction ?

A

It becomes increased

B

It becomes decreased

C

It is first increased and then decreased

D

It is not affected at all

Question 61: Palette 61/194

Allen MCQ

Enzyme inhibition caused by a product of the same biochemical reaction is :-

A

Competitive inhibition

B

Feed-back inhibition

C

In competitive inhibition

D

Semi-competitive inhibition

Question 62: Palette 62/194

Allen MCQ

At boiling temperature of water, what will be effect on an enzyme :-

A

become denatured

B

remain unaffected

C

become inactivated

D

become more active

Question 63: Palette 63/194

Allen MCQ

Enzyme have very narrow optima for :-

A

Light

B

Temperature

C

pH

D

Humidity

Question 64: Palette 64/194

Allen MCQ

Which enzyme is not a protein ?

A

Hexokinase

B

Synthetase

C

Endonuclease

D

Ribozyme

Question 65: Palette 65/194

Allen MCQ

Which of the following statements regarding enzyme inhibition is correct ?

A

Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate

B

Competitive inhibition is seen, when a substrate competes with an enzyme for binding to an inhibitor protein

C

Competitive inhibition is seen, when the substrate and the inhibitor compete for the active site on the enzyme

D

Non-competitive inhibitors often bind to the enzyme irreversibly.

Question 66: Palette 66/194

Allen MCQ

The catalytic efficiency of two different enzyme can be compared by the :

A

The $K_m$ value

B

The pH optimum value

C

Formation of the product

D

Molecular size of the enzyme

Question 67: Palette 67/194

Allen MCQ

Which of the following is/are structural analogue(s) of p-amino benzoic acid?

A

Malonate

B

Glucose-6-phosphate

C

AMP

D

Sulpha drugs

Question 68: Palette 68/194

Allen MCQ

An organic substance bound to an enzyme and essential for its activity is called

A

Apoenzyme

B

Isoenzyme

C

Coenzyme

D

Holoenzyme

Question 69: Palette 69/194

Allen MCQ

A competitive inhibitor of succinic dehydrogenase is :-

A

α-ketoglutarate

B

Malate

C

Malonate

D

Oxaloacetate

Question 70: Palette 70/194

Allen MCQ

For its activity, carboxypeptidase requires :-

A

Niacin

B

Copper

C

Zinc

D

Iron

Question 71: Palette 71/194

Allen MCQ

Transition state structure of the substrate formed during an enzymatic reaction is :

A

permanent and stable

B

transient but stable

C

permanent but unstable

D

transient and unstable

Question 72: Palette 72/194

Allen MCQ

The essential chemical components of many coenzymes are :

A

Vitamins

B

Proteins

C

Nucleic acids

D

Carbohydrates

Question 73: Palette 73/194

Allen MCQ

Enzyme catalysing the linking together of 2 compounds :-

A

Lyases

B

Transferases

C

Hydrolases

D

Ligases

Question 74: Palette 74/194

Allen MCQ

Which one of the following is a non - reducing carbohydrate ?

A

Maltose

B

Sucrose

C

Lactose

D

Ribose

Question 75: Palette 75/194

Allen MCQ

The chitinous exoskeleton of arthropods is formed by the polymerisation of :

A

lipoglycans

B

keratin sulphate and chondroitin sulphate

C

D-glucosamine

D

N-acetyl glucosamine

Question 76: Palette 76/194

Allen MCQ

One of the major components of cell wall of most fungi is :-

A

Chitin

B

Peptidoglycan

C

Cellulose

D

Hemicellulose

Question 77: Palette 77/194

Allen MCQ

A typical fat molecule is made up of :-

A

Three glycerol molecules and one fatty acid molecule

B

One glycerol and three fatty acid molecules

C

One glycerol and one fatty acid molecule

D

Three glycerol and three fatty acid molecules

Question 78: Palette 78/194

Allen MCQ

Which of the following is the least likely to be involved in stabilizing the three– dimensional folding of most proteins?

A

Hydrophobic interaction

B

Ester bonds

C

Hydrogen bonds

D

Electrostatic interaction

Question 79: Palette 79/194

Allen MCQ

A non-proteinaceous enzyme is :-

A

Ligase

B

Deoxyribonuclease

C

Lysozyme

D

Ribozyme

Question 80: Palette 80/194

Allen MCQ

Which of the following describes the given graph correctly?

A

Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme

B

Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme

C

Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme

D

Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.

Question 81: Palette 81/194

Allen MCQ

Which of the following are not polymeric ?

A

Proteins

B

Polysaccharides

C

Lipids

D

Nucleic acids

Question 82: Palette 82/194

Allen MCQ

Which one of the following statements is correct, with reference to enzymes ?

A

Holoenzyme = Apoenzyme + Coenzyme

B

Coenzyme = Apoenzyme + Holoenzyme

C

Holoenzyme = Coenzyme + Co-factor

D

Apoenzyme = Holoenzyme + Coenzyme

Question 83: Palette 83/194

Allen MCQ

The two functional groups characteristic of sugars are

A

hydroxyl and methyl

B

carbonyl and methyl

C

carbonyl and phosphate

D

carbonyl and hydroxyl

Question 84: Palette 84/194

Allen MCQ

Which of the following is an amino acid derived hormone ?

A

Epinephrine

B

Ecdysone

C

Estradiol

D

Estriol

Question 85: Palette 85/194

Allen MCQ

Which of the following glucose transporters is insulin-dependent ?

A

GLUT I

B

GLUT II

C

GLUT III

D

GLUT IV

Question 86: Palette 86/194

Allen MCQ

Concanavalin A is :

A

an alkaloid

B

an essential oil

C

a lectin

D

a pigment

Question 87: Palette 87/194

Allen MCQ

Consider the following statements : (A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group. (B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme. Select the correct option.

A

Both (A) and (B) are true.

B

(A) is true and (B) is false.

C

Both (A) and (B) are false.

D

(A) is false and (B) is true.

Question 88: Palette 88/194

Allen MCQ

Which of the following organic compounds is the main constituent of Lecithin ?

A

Arachidonic acid

B

Phospholipid

C

Cholesterol

D

Phosphoprotein

Question 89: Palette 89/194

Allen MCQ

"Ramachandran plot" is used to confirm the structure of :-

A

RNA

B

Proteins

C

Triacylglycerides

D

DNA

Question 90: Palette 90/194

Allen MCQ

Prosthetic groups differ from co-enzymes in that :-

A

they require metal ions for their activity.

B

they (prosthetic groups) are tightly bound to apoenzymes.

C

their association with apoenzymes is transient.

D

they can serve as co-factors in a number of enzyme-catalyzed reactions.

Question 91: Palette 91/194

Allen Match the Columns

Match the following Column-I with Column-II:

Column-I	Column-II
(A) Inhibitor of catalytic (B) Possess peptide bonds (C) Cell wall material in (D) Secondary metabolite	(I) Ricin activity (II) Malonate (III) Chitin fungi (IV) Collagen

A

A-II, B-III, C-I, D-IV

B

A-II, B-IV, C-III, D-I

C

A-III, B-I, C-IV, D-II

D

A-III, B-IV, C-I, D-II

Question 92: Palette 92/194

Allen MCQ

Identify the basic amino acid from the following.

A

Valine

B

Tyrosine

C

Glutamic Acid

D

Lysine

Question 93: Palette 93/194

Allen MCQ

Which of the following is the most abundant protein in the animals ?

A

Insulin

B

Haemoglobin

C

Collagen

D

Lectin

Question 94: Palette 94/194

Allen MCQ

Identify the substances having glycosidic bond and peptide bond, respectively in their structure :

A

Inulin, insulin

B

Chitin, Cholesterol

C

Glycerol, trypsin

D

Cellulose, lecithin

Question 95: Palette 95/194

Allen MCQ

Identify the statement which is incorrect.

A

Sulphur is an integral part of cysteine.

B

Glycine is an example of lipids.

C

Lecithin contains phosphorus atom in its structure.

D

Tyrosine possesses aromatic ring in its structure.

Question 96: Palette 96/194

Allen MCQ

Which of the following are not secondary metabolites in plants ?

A

Morphine, codeine

B

Amino acids, glucose

C

Vinblastin, curcumin

D

Rubber, gums

Question 97: Palette 97/194

Allen Match the Columns

Match Column - I with Column - II.

Column-I	Column-II
(A) Protein (B) Unsaturated fatty acid (C) Nucleic acid (D) Polysaccharide	(I) C = C double bonds (II) Phosphodiester bonds (III) Glycosidic bonds (IV) Peptide bonds

A

A-IV, B-I, C-II, D-III

B

A-I, B-IV, C-III, D-II

C

A-II, B-I, C-IV, D-III

D

A-IV, B-III, C-I, D-II

Question 98: Palette 98/194

Allen MCQ

Identify the incorrect pair.

A

Alkaloids – Codeine

B

Toxin – Abrin

C

Lectins – Concanavalin A

D

Drugs – Ricin

Question 99: Palette 99/194

Allen MCQ

Following are the statements with reference to 'lipids'.
(a) Lipids having only single bonds are called unsaturated fatty acids. (b) Lecithin is a phospholipid. (c) Trihydroxy propane is glycerol. (d) Palmitic acid has 20 carbon atoms including carboxyl carbon. (e) Arachidonic acid has 16 carbon atoms.
Choose the correct answer from the options given below.

A

(a) and (b) only

B

(c) and (d) only

C

(b) and (c) only

D

(b) and (e) only

Question 100: Palette 100/194

Allen MCQ

Exoskeleton of arthropods is composed of

A

Cellulose

B

Chitin

C

Glucosamine

D

Cutin

Question 101: Palette 101/194

Allen MCQ

Read the following statements on lipids and find out correct set of statements:
(a) Lecithin found in the plasma membrane is a glycolipid
(b) Saturated fatty acids possess one or more c = c bonds
(c) Gingelly oil has lower melting point, hence remains as oil in winter
(d) Lipids are generally insoluble in water but soluble in some organic solvents
(e) When fatty acid is esterified with glycerol, monoglycerides are formed
Choose the correct answer from the options given below:

A

(a), (d) and (e) only

B

(c), (d) and (e) only

C

(a), (b) and (d) only

D

(a), (b) and (c) only

Question 102: Palette 102/194

Allen MCQ

A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is ${ \sf C } _ { 6 } { \sf H } _ { 1 2 } 0 _ { 6 }$ then what is the formula for maltose ?

A

$\mathsf { C } _ { 1 2 } \mathsf { H } _ { 2 4 } \mathsf { O } _ { 1 2 }$

B

$\mathsf { C } _ { 1 2 } \mathsf { H } _ { 2 2 } \mathsf { O } _ { 1 1 }$

C

$\mathsf C _ { 1 2 } \mathsf H _ { 2 4 } \mathsf O _ { 1 1 }$

D

${ \mathsf { C } } _ { 1 2 } { \mathsf { H } } _ { 2 0 } { \mathsf { O } } _ { 1 0 }$

Question 103: Palette 103/194

Allen Match the Columns

Match Column-I Column-II :
Choose the correct answer from the options given below :

Column-I	Column-II
(A) Adenine (B) Anthocyanin (C) Chitin (D) Codeine	(I) Pigment (II) Polysaccharide (III) Alkaloid (IV) Purine

A

A-IV, B-I, C-II, D-III

B

A-IV, B-III, C-II, D-I

C

A-III, B-I, C-IV, D-II

D

A-I, B-IV, C-III, D-II

Question 104: Palette 104/194

Allen MCQ

Primary proteins are also called as polypeptides because :

A

They are linear chains

B

They are polymers of peptide monomers

C

Successive amino acids are joined by peptide bonds

D

They can assume many conformations

Question 105: Palette 105/194

Allen MCQ

In the enzyme which catalyses the breakdown of: H₂O₂ → H₂O + O₂ the prosthetic group is :

A

Nicotinamide adenine dinucleotide

B

Haem

C

Zinc

D

Niacin

Question 106: Palette 106/194

Allen MCQ

Given below are two statements: Statement-I : Amino acids have a property of ionizable nature of $–NH_2$ and –COOH groups, hence have different structures at different pH. Statement-II : Amino acids can exist as Zwitterionic form at acidic and basic pH. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both Statement-I and Statement-II are correct

B

Both Statement-I and Statement-II are Incorrect

C

Statement-I is correct but Statement-II is incorrect

D

Statement-I is incorrect but Statement-II is correct

Question 107: Palette 107/194

Allen MCQ

Cellulose does not form blue colour with Iodine because

A

It is a helical molecule.

B

It does not contain complex helices and hence cannot hold iodine molecules.

C

It breaks down when iodine reacts with it.

D

It is a disaccharide.

Question 108: Palette 108/194

Allen MCQ

Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of

A

Amylase

B

Lipase

C

Dinitrogenase

D

Succinic dehydrogenase

Question 109: Palette 109/194

Allen MCQ

Given below are two statements : Statement-I : A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (N-terminal). Statement-II : Adult human haemoglobin, consists of 4 subunits (two subunits of α type and two subunits β type.) In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are false.

B

Statement I is true but Statement II is false.

C

Statement I is false but Statement II is true.

D

Both Statement I and Statement II are true.

Question 110: Palette 110/194

Allen MCQ

Given below are two statements : Statement-I : Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat. Statement-II : When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor. In the light of the above statements, choose the correct answer from the options given below :

A

Both Statement I and Statement II are false.

B

Statement I is true but Statement II is false.

C

Statement I is false but Statement II is true.

D

Both Statement I and Statement II are true.

Question 111: Palette 111/194

Allen Match the Columns

Match Column-I with Column-II.

Column-I	Column-II
(A) Protein (B) Unsaturated fatty acid (C) Nucleic acid (D) Polysaccharide	(I) C=C double bonds (II) Phosphodiester bond (III) Glycosidic bonds (IV) Peptide bonds

A

A-II, B-I, C-IV, D-III

B

A-IV, B-III, C-I, D-II

C

A-IV,B-I, C-II, D-III

D

A-I, B-IV, C-III, D-II

Question 112: Palette 112/194

Allen MCQ

Inulin is a polymer of :

A

Fructose

B

Galactose

C

Amino acids

D

Glucose

Question 113: Palette 113/194

Allen MCQ

Which of the following is not a secondary metabolite?

A

Curcumin

B

Morphine

C

Anthocyanin

D

Lecithin

Question 114: Palette 114/194

Allen Match the Columns

Match Column-I Column-II. Choose the correct answer from the
options given below :

Column-I	Column-II
(A) Terpenoids (B) Lectins (C) Alkaloids (D) Toxins	(I) Codeine (II) Diterpenes (III) Ricin (IV) Concanavalin A

A

A-II, B-IV, C-III, D-I

B

A-II, B-I, C-IV, D-III

C

A-II, B-III, C-I, D-IV

D

A-II, B-IV, C-I, D-III

Question 115: Palette 115/194

Allen MCQ

Lecithin, a small molecular weight organic compound found in living tissues, is an example of :

A

Amino acids

B

Phospholipids

C

Glycerides

D

Carbohydrates

Question 116: Palette 116/194

Allen MCQ

Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of :

A

Cofactor inhibition

B

Feedback inhibition

C

Competitive inhibition

D

Enzyme activation

Question 117: Palette 117/194

Allen Match the Columns

Match Column-I with Column-II. Choose the correct answer from the options given below:

Column-I	Column-II
(A) GLUT-4 (B) Insulin (C) Trypsin (D) Collagen	(I) Hormone (II) Enzyme (III) Intercellular ground substance (IV) Enables glucose transport into cells

A

A–IV, B–I, C–II, D–III

B

A–I, B–II, C–III, D–IV

C

A–II, B–III, C–IV, D–I

D

A–III, B–IV, C–I, D–II

Question 118: Palette 118/194

Allen MCQ

Regarding catalytic cycle of an enzyme action, select the correct sequential steps : A. Substrate enzyme complex formation. B. Free enzyme ready to bind with another substrate. C. Release of products. D. Chemical bonds of the substrate broken E. Substrate binding to active site. Choose the correct answer from the options given below:

A

E, A, D, C, B

B

A, E, B, D, C

C

B, A, C, D, E

D

E, D, C, B, A

Question 119: Palette 119/194

Allen Match the Columns

Match Column I with Column-II : Choose the correct answer from the options given below:

Column-I	Column-II
(A) Lipase (B) Nuclease (C) Protease (D) Amylase	(I) Peptide bond (II) Ester bond (III) Glycosidic bond (IV) Phosphodiester bond

A

A-IV, B-II, C-III, D-I

B

A-III, B-II, C-I, D-IV

C

A-II, B-IV, C-I, D-III

D

A-IV, B-I, C-III, D-II

Question 120: Palette 120/194

Allen MCQ

Ligases is a class of enzymes responsible for catalysing the linking together of two compounds. Which of the following bonds is not catalysed by it ?

A

C–C

B

P – O

C

C – O

D

C – N

Question 121: Palette 121/194

Allen MCQ

Which of the following are not fatty acids ? A. Glutamic acid B. Arachidonic acid C. Palmitic acid D. Lecithin E. Aspartic acid Choose the correct answer from the options given below :

A

C, D and E only

B

A and B only

C

A, D and E only

D

B and C only

Question 122: Palette 122/194

Allen MCQ

Which of the following graphs depicts the effect of substrate concentration on velocity of enzyme catalysed reaction ?

A

B

C

D

Question 123: Palette 123/194

Allen Match the Columns

Match Column-I with Column-II.

Column-I	Column-II
(A) Primary structure of protein (B) Secondary structure of protein (C) Tertiary structure of protein (D) Quaternary structure of protein	(I) Human haemoglobin (II) Disulphide bonds (III) Polypeptide chain (IV) Alpha helix and β sheet

A

A-III, B-IV, C-II, D-I

B

A-III, B-II, C-I, D -IV

C

A-I, B-III, C-II, D-IV

D

A-IV, B-III, C-II, D-I

Question 124: Palette 124/194

Allen MCQ

Which of the following compound is present in acid soluble pool when we analyse chemical composition?

A

Protein

B

Lipid

C

Glucose

D

Carotenoid

Question 125: Palette 125/194

Allen MCQ

Which of the following elements present most abundantly on earth crust?

A

Carbon

B

Hydrogen

C

Oxygen

D

Silicon

Question 126: Palette 126/194

Allen MCQ

If $–NH_2$ group and –COOH group are attached on same carbon in any amino acid, then these types of amino acids are known as :

A

α-AA

B

β-AA

C

γ-AA

D

All

Question 127: Palette 127/194

Allen MCQ

Variations in amino acids depend on :

A

Side group

B

Ester group

C

Complexity of cell

D

None of them

Question 128: Palette 128/194

Allen MCQ

How many carbon atoms are found in arachidonic acid?

A

16

B

18

C

20

D

22

Question 129: Palette 129/194

Allen MCQ

Which of the following AA is basic ?

A

Valine

B

Lysine

C

Glutamic acid

D

Glycine

Question 130: Palette 130/194

Allen MCQ

How many total carbons are found in Palmitic acid?

A

15

B

16

C

17

D

18

Question 131: Palette 131/194

Allen MCQ

Lipid may be :

A

Monoglyceride

B

Diglyceride

C

Triglyceride

D

All the above

Question 132: Palette 132/194

Allen MCQ

This amino acid is :

A

Serine

B

Alanine

C

Glycine

D

Arginine

Question 133: Palette 133/194

Allen MCQ

Which functional group is common in fatty acid & amino acid ?

A

–COOH

B

$–NH_2$

C

–OH

D

All

Question 134: Palette 134/194

Allen MCQ

In proteins, amino acids are attached together by :

A

Peptide bond

B

Amide bond

C

Ester bond

D

Both (1) & (2)

Question 135: Palette 135/194

Allen MCQ

Proteins can act as :

A

transporter of nutrients across cell membrane

B

Hormones

C

Enzymes

D

All

Question 136: Palette 136/194

Allen MCQ

Which of the following is homopolysaccharide?

A

Cellulose

B

Starch

C

Glycogen

D

All

Question 137: Palette 137/194

Allen MCQ

All the elements present in a sample of earth's crust are also present in a sample of living tissue, but which of the following element is higher in any living organism than in earth's crust?

A

Hydrogen, Oxygen, Carbon and Silicon.

B

Hydrogen, Oxygen, Carbon, Nitrogen and Silicon

C

Hydrogen, Oxygen, Carbon, Nitrogen and Sulphur.

D

Hydrogen, Oxygen, Carbon, Nitrogen, Sulphur and Sodium

Question 138: Palette 138/194

Allen MCQ

Pigments are considered as the secondary metabolites, having some particular functions. Which of the following is an example of pigments?

A

Carotenoids

B

Codeine

C

Concanavalin-A

D

Curcumin

Question 139: Palette 139/194

Allen MCQ

Which of the following can not be considered as the example of polymeric substances?

A

Rubber

B

Gums

C

Cellulose

D

Vinblastin

Question 140: Palette 140/194

Allen MCQ

Select the correctly matched.

A

Anthocyanins - Alkaloids

B

Carotenoids - Toxins

C

Ricin - Drugs

D

Lemon grass oil - Essential oils.

Question 141: Palette 141/194

Allen MCQ

Which of the following amino acid having H(Hydrogen) as R group?

A

Glycine

B

Alanine

C

Serine

D

Leucine

Question 142: Palette 142/194

Allen MCQ

Physical and chemical properties of amino acids depend on

A

Amino group

B

Carboxylic group

C

R-group

D

All of the above

Question 143: Palette 143/194

Allen MCQ

Which of the following represents the structure of Ribose ?

A

B

C

D

Question 144: Palette 144/194

Allen MCQ

Enzymes, which catalyse the transfer of hydrogen (H) between two substrates, are called:-

A

Transferases

B

Oxidoreductases

C

Isomerases

D

Hydrolases

Question 145: Palette 145/194

Allen MCQ

Which of the following statements is correct?

A

All the proteins are enzymes

B

All enzymes are proteins

C

Almost all enzymes are proteins

D

All enzymes are nucleic acids

Question 146: Palette 146/194

Allen MCQ

Low temperature preserves the enzyme in a ...'A'... state whereas high temperature destroys enzymatic activity because proteins are ...'B'... by heat. Choose the correct option:-

A

A = temporarily inactive, B = denatured

B

A = permanently inactive, B = temporarily inactive

C

A = permanently inactive, B = denatured

D

A = denatured, B = temporarily inactive

Question 147: Palette 147/194

Allen MCQ

Which of the following is not correct?

A

Catabolic pathways lead to the release of energy

B

Anabolic pathways consume energy

C

The living state and metabolism are synonymous

D

$\mathsf { C O } _ { 2 }$ dissolving in water is an uncatalysed reaction in living systems

Question 148: Palette 148/194

Allen MCQ

A general rule of thumb is that rate of enzymatic reactions doubles or decreases by half for every __________change in either direction. Choose correct option for above blank.

A

$5 0 ^ { \circ }$

B

$5 \%$

C

$100 ^ { \circ } C$

D

$1 0 ^ { \circ } \mathsf { C }$

Question 149: Palette 149/194

Allen MCQ

Non proteinaceous part of holoenzyme can be:

A

metal ion

B

prosthetic group

C

Coenzyme

D

All of the above

Question 150: Palette 150/194

Allen MCQ

Which of the following can have catalytic power?

A

Protein

B

Nucleic acid

C

Fat

D

Both (1) and (2)

Question 151: Palette 151/194

Allen MCQ

Catalytic activity is lost when the co-factor is removed from the enzyme. It testifies that :-
(a) Cofactors form one or more coordination bonds with enzymes.
(b) Cofactors play a crucial role in the catalytic activity of the enzyme
(c) Cofactors are not made up of proteins
(d) Cofactors show permanent association with enzymes

A

(a) and (d)

B

Only (b)

C

(b) and (c)

D

(a), (b) and (c)

Question 152: Palette 152/194

Allen MCQ

Above diagram is the indicative diagram of a type of inhibition. Choose the correct match:-

A

Type of inhibition - Non-competitive reversible, Substrate - Malonate, Inhibitor - Succinate

B

Type of inhibition - Competitive, Substrate - Succinic dehydrogenase, Inhibitor - Malonate

C

Type of inhibition - Non-competitive irreversible, Substrate - Succinic dehydrogenase, Inhibitor - Succinate

D

Type of inhibition - Competitive, Substrate - Succinate, Inhibitor - Malonate

Question 153: Palette 153/194

Allen MCQ

On the basis of type of reactions they catalyse, enzymes are divided into classes each with __________ subclasses. Choose the correct numbers for above blanks respectively from the following options :-

A

$6 , 6$

B

6, 4–13

C

4–13, 6

D

4, 13

Question 154: Palette 154/194

Allen MCQ

Inorganic catalysts work efficiently at high temperatures while enzymes get damaged at high temperatures (above 40°C). This feature of enzymes is not applicable to :-

A

The enzymes which are made up of proteins

B

The enzymes isolated from thermophilic organisms

C

The enzymes which have active sites

D

The enzymes of organisms who live in hot vents

Question 155: Palette 155/194

Allen MCQ

In the absence of any enzyme, reaction $CO_2 + H_2O \longrightarrow H_2CO_3$ is very slow, formation of 200 molecules of $H_2CO_3$ per hour. However by the use of carbonic anhydrase enzyme reaction speeds with about :-

A

formation of $6 \times 10^5$ molecules of $H_2CO_3$ every second

B

formation of $36 \times 10^5$ molecules of $H_2CO_3$ every minute

C

formation of $36 \times 10^6$ molecules of $H_2CO_3$ every second

D

formation of $6 \times 10^6$ molecules of $H_2CO_3$ every minute

Question 156: Palette 156/194

Allen MCQ

Stability is something related to energy status of the molecule. Transition state is high energy state as compare to substrate. So we can conclude that :-

A

Transition state is more stable than substrate

B

substrate is more stable than transition state

C

Both substrate and transition state are very much unstable

D

Stability can not be compared

Question 157: Palette 157/194

Allen MCQ

The activity of an enzyme can be affected by a change in the conditions which can alter the:-

A

tertiary structure of nucleic acids

B

primary structure of fats

C

tertiary structure of proteins

D

secondary structure of carbohydrates

Question 158: Palette 158/194

Allen MCQ

Which of the following statements is not correct regarding enzymes ?

A

They are specific in nature

B

They are used up in reaction

C

They are proteinaceous in nature

D

They speed up the rate of biochemical reactions.

Question 159: Palette 159/194

Allen MCQ

Which of the following statements regarding cofactors is not correct ?

A

Every coenzyme is a cofactor but every cofactor is not a coenzyme

B

Catalytic activity is lost when the cofactor is removed from the enzyme

C

Every coenzyme is a cofactor and every cofactor is a coenzyme

D

In the catalase enzyme, haem group work as a cofactor

Question 160: Palette 160/194

Allen MCQ

The prosthetic group can be distinguished from other cofactors of enzymes because prosthetic groups:-

A

are organic in nature

B

are tightly bound to the apoenzyme

C

Both 1 and 2

D

are inorganic in nature and are loosely bound to the apoenzyme

Question 161: Palette 161/194

Allen MCQ

Ribozymes are :-

A

Enzymes with tertiary structure of protein

B

Fragments of endoplasmic reticulum those contain ribosomes

C

Inorganic enzymes

D

Nucleic acids that behave like enzymes

Question 162: Palette 162/194

Allen MCQ

Represented below is the effect of change in pH on enzyme activity. Which one of the following conclusions can be made by this diagram ?

A

Enzyme show its highest activity at a particular pH, both below and above this pH, activity declines

B

With increasing pH, activity increases upto a limit then it become constant

C

At a particular pH, activity is minimum, both below and above this pH, activity increases

D

Enzyme activity is affected by temperature not by pH so it is completely a hypothetical graph

Question 163: Palette 163/194

Allen Match the Columns

Match the Column-I(Example) with Column-II(Type of cofactor) :-

Column-I	Column-II
(A) NAD with dehydrogenase enzyme (B) Zn with carboxypeptidase enzyme (C) Haem group with catalase enzyme	(I) Metal ion (II) Prosthetic group (III) Coenzyme

A

A–i, B–ii, C–iii

B

A–iii, B–ii, C–i

C

A–iii, B–i, C–ii

D

A–ii, B–iii, C–i

Question 164: Palette 164/194

Allen MCQ

${ \mathsf { C O } } _ { 2 } + { \mathsf { H } } _ { 2 } { \mathsf { O } } \longrightarrow { \mathsf { A } }$ Choose the correct option for A and B in the given reaction :- pH

A

B-Product of this reaction, A-Enzyme of this reaction

B

A-Product of this reaction, B-Rate of formation of product of this enzyme is 360 lakh molecules/sec.

C

A-Carbonic acid, B-Rate of formation of product of this enzyme is 6,00,000 molecules/sec.

D

A-Transient state, B-Enzyme of this reaction

Question 165: Palette 165/194

Allen MCQ

Which of the following statements is not correct ?

A

Enzymes bring down the activation energy of the processes

B

Enzymes are preserved in a temporary inactive state at high temperature

C

Enzymes isolated from thermophilic organisms have thermal stability

D

Enzymes are differ from inorganic catalysts because enzymes get damaged at high temperature.

Question 166: Palette 166/194

Allen MCQ

A

Energy level of A is low as compared to B

B

Energy level of B is high as compared to C

C

Energy level of D is high as compared to E

D

Energy level of C is low as compared to A and B

Question 167: Palette 167/194

Allen MCQ

Above diagram showing the concept of activation energy. If in this diagram energy level of ‘P’ become higher than the energy level of ‘S’ then which of the following will not apply for this diagram ?

A

The process will be endothermic

B

Activation energy with enzyme will be less than activation energy without enzyme

C

Energy difference between transition state and product will be more than activation energy

D

The substrate will go through the transition state

Question 168: Palette 168/194

Allen MCQ

(i) Transient association with the protein part of conjugated enzyme (ii) Non protein organic substance (iii) Usually made up of vitamins All the above characters are applicable to :-

A

Apoenzyme

B

Holoenzyme

C

Coenzyme

D

Isoenzyme

Question 169: Palette 169/194

Allen MCQ

An enzyme catalysing a transfer of a group, G between a pair of substrate S and S' as follows: S – G + S' ⎯→ S + S' – G G = phosphate or hydrogen or any other group, the enzyme is related with which of the following class?

A

Transferases

B

Dehydrogenases

C

Both (1) and (2)

D

Either (1) or (2)

Question 170: Palette 170/194

Allen MCQ

Which element is present negligible in human body?

A

O

B

C

C

H

D

Si

Question 171: Palette 171/194

Allen MCQ

Which of the following compound is found in acid soluble pool during analysis of a living tissue?

A

Protein

B

Lipid

C

Polysaccharide

D

Monosaccharide

Question 172: Palette 172/194

Allen MCQ

Which of the following is not a macromolecule?

A

Amino acid

B

Nucleotide

C

Monosaccharide

D

All the above

Question 173: Palette 173/194

Allen MCQ

α-amino acids are those, which –

A

Participates in lipid synthesis

B

–COOH group and $–NH_2$ group are attached on same carbon

C

21 types 3 21 types

D

All the above are correct

Question 174: Palette 174/194

Allen MCQ

Which of the following is correct statement?

A

Amino acids may be considered as substituted methane

B

α-AA have difference only in R group

C

In serine, R-group is hydroxy methyl

D

All of the above

Question 175: Palette 175/194

Allen MCQ

What is the R group in Glycine?

A

$–CH_2$–OH

B

–H

C

$–CH_3$

D

None of them

Question 176: Palette 176/194

Allen MCQ

Which of the following is acidic amino acid?

A

Valine

B

Glutamic acid

C

Arginine

D

Lysine

Question 177: Palette 177/194

Allen MCQ

Which of the following is aromatic AA?

A

Tyrosine

B

Tryptophan

C

Phenyl alanine

D

All the above

Question 178: Palette 178/194

Allen MCQ

Which of the following is component of simple lipid?

A

Glycerol

B

Glycol

C

Fatty acid

D

Both (1) & (3)

Question 179: Palette 179/194

Allen MCQ

The lipid which is found in cell membrane is

A

Phospholipid

B

Lecithin

C

Both (1) & (2)

D

Palmitic acid

Question 180: Palette 180/194

Allen MCQ

Heterocyclic ring is found in which compound?

A

N-bases

B

Ring structure of monosaccharides

C

Protein

D

Both (1) & (2)

Question 181: Palette 181/194

Allen MCQ

Following structure is related to which AA? COOH H—C—$NH_2$ I $CH_3$

A

Glycine

B

Alanine

C

Serine

D

Tyrosine

Question 182: Palette 182/194

Allen MCQ

Following structure is –

A

α-Glucose

B

β-Glucose

C

Ribose

D

Deoxyribose

Question 183: Palette 183/194

Allen MCQ

Which of the following is secondary metabolites?

A

Rubber

B

Alkaloids

C

Terpenoids

D

All the above

Question 184: Palette 184/194

Allen MCQ

Which of the following statement is correct?

A

Lipid is biomacromolecule

B

Lipid has <1000 daltons molecular weight

C

Proteins are heteropolymer

D

All the above are correct except (1)

Question 185: Palette 185/194

Allen MCQ

DNA is –

A

Biomacromolecule

B

Acidic in nature

C

Polymer of nucleotide

D

All of the above

Question 186: Palette 186/194

Allen MCQ

All the following statements about the structure of glycogen are true, except :-

A

Branched chains occur, after every ten residues

B

It is a copolymer of glucose and mannose

C

It contains $\alpha$–1, 4–glycosidic linkages

D

It contains $\alpha$ 1, 6–glycosidic linkages

Question 187: Palette 187/194

Allen MCQ

In the following diagrammatic representation A and B is :-

A

$\mathsf { A } \to \mathsf { G } \mathsf { - } \mathsf { 6 } \mathsf { - } \mathsf { P } , \mathsf { B } \to \mathsf { A } \mathsf { T } \mathsf { P }$

B

$\mathsf { A } \to \mathsf { A M P } , \mathsf { B } \to \mathsf { A T P }$

C

$\mathsf { A } \to \mathsf { F r u c t o s e { \mathrm { - } } 6 \mathrm { - } P } , \mathsf { B } \to \mathsf { A T P }$

D

$\mathsf { A } \to \mathsf { A T P } , \mathsf { B } \to \mathsf { A D P }$

Question 188: Palette 188/194

Allen MCQ

Above graph is showing the effect of substrate concentration (S) on enzymatic activity. If due to change in enzymatic activity $\mathsf { K } _ { \mathsf { m } }$ value changes to $\mathsf { K } _ { \mathsf { m } } ^ { \prime }$ then which of the following can be conclude on the basis of this change?

A

There is a significant increase in enzymatic activity

B

Entry of positive allosteric modulator in enzymatic activity

C

Entry of non-competitive inhibitor in enzymatic activity

D

In enzymatic activity, entry of inhibitor which closely resembles the substrate in its molecular structure

Question 189: Palette 189/194

Allen MCQ

One molecule of enzyme convert 5 molecules of substrate into product in 5 minutes. 20 molecules of substrate and two molecules of enzyme are mixed in a test tube. After 10 minutes the test tube will have :-

A

products and 10 unreacted molecules of substrate

B

only products

C

10 unreacted molecules of substrate, enzymes and products

D

products and enzymes

Question 190: Palette 190/194

Allen MCQ

The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (1-4) the components of reaction labelled as A, B, C and D are identified correctly? Progress of reaction

A

A - Transition state, B - Potential energy, C - Activation energy without enzyme, D - Activation energy with enzyme

B

A - Potential Energy, B - Transition state, C - Activation energy with enzyme, D - Activation energy without enzyme

C

A - Activation energy with enzyme, B - Transition state, C - Activation energy without enzyme, D - Potential Energy

D

A - Potential Energy, B - Transition state, C - Activation energy with enzyme, D - Activation energy without enzyme

Question 191: Palette 191/194

Allen MCQ

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?

A

Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperatures $8 0 ^ { \circ } - 9 0 ^ { \circ } C$

B

Enzymes are highly specific

C

Most enzymes are proteins but some are lipids

D

Enzymes require optimum pH for maximal activity

Question 192: Palette 192/194

Allen MCQ

Which one of the following structural formulae of two organic compounds is correctly identified along with its related function ? A B

A

B : adenine - a nucleotide that makes up nucleic acids

B

A : Triglyceride - major source of energy

C

B : Uracil - a component of DNA

D

A : Lecithin - a component of cell membrane

Question 193: Palette 193/194

Allen MCQ

The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration) What do the two axises (x and y) represent ?

A

x-axis-Enzymatic activity, y-axis-pH

B

x-axis-Temperature, y-axis-Enzyme activity

C

x-axis-Substrate concentration, y-axis-Enzymatic activity

D

x-axis-Enzymatic activity, y-axis-Temperature

Question 194: Palette 194/194

Allen MCQ

Which one out of A - D given below correctly represents the structural formula of the basic amino acid ?

A

A

B

B

C

C

D

D