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Biomolecules

102 Questions
All Exams NEET AIIMS
2019 NEET MCQ
NEET 2019
Concanavalin A is :
A.
a lectin
B.
a pigment
C.
an alkaloid
D.
an essential oil
2018 NEET MCQ
NEET 2018
The two functional groups characteristic of sugars are
A.
carbonyl and methyl
B.
carbonyl and hydroxyl.
C.
hydroxyl and methyl
D.
carbonyl and phosphate
2017 NEET MCQ
NEET 2017
Which 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
2017 NEET MCQ
NEET 2017
Which of the following are not polymeric?
A.
Proteins
B.
Polysaccharides
C.
Lipids
D.
Nucleic acids
2016 NEET MCQ
NEET 2016 Phase 2
A non-proteinaceous enzyme is
A.
Iysozyme
B.
ribozyme
C.
ligase
D.
deoxyribonuclease.
2016 NEET MCQ
NEET 2016 Phase 2
Which of the following is the least likely to be involved in stablishing the three-dimensional folding of most proteins?
A.
Hydrogen bonds
B.
Electrostatic interaction
C.
Hydrophobic interaction
D.
Ester bonds
2016 NEET MCQ
NEET 2016 Phase 2
Which of the following describes the given graph correctly?

NEET 2016 Phase 2 Biology - Biomolecules Question 98 English
A.
Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
B.
Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
C.
Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
D.
Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
2016 NEET MCQ
NEET 2016 Phase 1
Which one of the following statements is wrong?
A.
Uracil is a pyrimidine.
B.
Glycine is a sulphur containing amino acid.
C.
Sucrose is a disaccharide.
D.
Cellulose is a polysaccharide.
2016 NEET MCQ
NEET 2016 Phase 1
A typical fat molecule is made up of
A.
one glycerol and one fatty acid molecule
B.
three glycerol and three fatty acid molecules
C.
three glycerol molecules and one fatty acid molecule
D.
one glycerol and three fatty acid molecules.
2015 NEET MCQ
AIPMT 2015
The chitinous exoskeleton of arthropods is formed by the polymerisation of
A.
N - acetyl glucosamine
B.
lipoglycans
C.
keratin sulphate and chondrotin sulphate
D.
D - glucosamine.
2015 NEET MCQ
AIPMT 2015
Which of the following biomolecules does have a phosphodiester bond?
A.
Amino acids in a polypeptide
B.
Nucleic acids in a nucleotide
C.
Fatty acids in a diglyceride
D.
Monosaccharides in a polysaccharide
2015 NEET MCQ
AIPMT 2015 Cancelled Paper
Which one of the following statements is incorrect?
A.
The compettive inhibitor does not affect the rate of breakdown of the enzyme -substrate complex.
B.
The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate
C.
A competitive inhibitor reacts reversibly with the enzyme to form and enzyme-inhibitor complex.
D.
In competitive inhibition, the inhibitor molecules is not chemically changed by the enzyme.
2014 NEET MCQ
AIPMT 2014
Which one of the following is a non - reducing carbohydrate?
A.
Maltose
B.
Sucrose
C.
Lactose
D.
Ribose 5-phosphate
2014 NEET MCQ
AIPMT 2014
Select the option which is not correct with respect to enzyme action.
A.
Substrate binds with enzyme at its active site.
B.
Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
C.
A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate.
D.
Malonate is a competitive inhibitor of succinic dehydrogenase.
2013 NEET MCQ
NEET 2013 (Karnataka)
The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled A - D. Which one of the following options is correct?
NEET 2013 (Karnataka) Biology - Biomolecules Question 84 English
A.
D is not acidic amino acid-glutamic acid.
B.
C is an aromatic amino acid-tryptophan.
C.
A is the C-terminal amino acid and D is N-terminal amino acid.
D.
A is a sulpur containing amino acid methionine.
2013 NEET MCQ
NEET 2013 (Karnataka)
Which of the following statements about enzymes is wrong?
A.
Enzymes are denaturated at high temperatures.
B.
Enzymes are mostly proteins but some are lipids also.
C.
Enzymes are highly specific.
D.
Enzymes require optimum pH and temperature for maximum activity.
2013 NEET MCQ
NEET 2013 (Karnataka)
Uridine, present only in RNA is a
A.
nucleoside
B.
nucleotide
C.
purine
D.
pyrimidine.
2013 NEET MCQ
NEET 2013
A phosphoglyceride is always made up of
A.
a saturated or unsaturated fatty acid esterified to glycerol molecule to which a phosphate group is also attached.
B.
a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule.
C.
only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
D.
only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
2013 NEET MCQ
NEET 2013
Macromolecule chitin is
A.
sulphur containing polysaccharide
B.
simple polysaccharide
C.
nitrogen containing polysaccharide
D.
phosphorous containing polysaccharide.
2013 NEET MCQ
NEET 2013
Transition state structure of the substrate formed during an enzymatic reaction is
A.
transient and unstable
B.
permanent and stable
C.
transient but stable
D.
permanent but unstable.
2013 NEET MCQ
NEET 2013
The essential chemical components of many coenzymes are
A.
carbohydrates
B.
vitamins
C.
proteins
D.
nucleic acids.
2012 NEET MCQ
AIPMT 2012 Mains
Which one of the following biomolecules is correctly characterized?
A.
Lecithin - a phosphorylated glyceride found in cell membrane.
B.
Palmitic acid - an unsaturated fatty acid with 18 carbon atoms.
C.
Adenylic acid - adenosine with a glucose phosphate molecule.
D.
Alanine amino acid - contains an amino group and an acidic group anywhere in the molecule.
2012 NEET MCQ
AIPMT 2012 Prelims
The given diagrammatic representation shows one of the caregories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component ''X'' in it.
AIPMT 2012 Prelims Biology - Biomolecules Question 81 English
A.
Category Component
Cholesterol Guanine
B.
Category Component
Amino acid NH2
C.
Category Component
Nucleotide Adenine
D.
Category Component
Nucleoside Uracil
2012 NEET MCQ
AIPMT 2012 Prelims
Which one out of A - D given below correctly represents the structural formula of the basic amino acid?

AIPMT 2012 Prelims Biology - Biomolecules Question 83 English
A.
C
B.
D
C.
A
D.
B
2012 NEET MCQ
AIPMT 2012 Prelims
Which one is the most abundant protein in the animal world?
A.
Trypsin
B.
Haemoglobin
C.
Collagen
D.
Insulin
2012 NEET MCQ
AIPMT 2012 Prelims
Which one of the following is wrong statement?
A.
Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
B.
Root module forming nitrogen fixers live as aerobes under free-living conditions.
C.
Phosphorus is a constituent of cell membrances, certain nucleic acids and all proteins.
D.
Nitrosomonas and Nitrobacter are chemo-autotrophs.
2011 NEET MCQ
AIPMT 2011 Prelims
The curve given below shows enzymatic activity in relation to three conditions (pH, temperature and substrate concentration). What do the two axes (x and y) represent?

AIPMT 2011 Prelims Biology - Biomolecules Question 78 English
A.
x-axis y-axis
enzymatic activity pH
B.
x-axis y-axis
temperature enzyme activity
C.
x-axis y-axis
substrate concentration enzymatic activity
D.
x-axis y-axis
enzymatic activity temperature
2011 NEET MCQ
AIPMT 2011 Prelims
Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?

AIPMT 2011 Prelims Biology - Biomolecules Question 77 English
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
2010 NEET MCQ
AIPMT 2010 Mains
The figure given below shows the conversion of a substate into product by an enzyme. In which one of the four options (a-d) the components of reaction labelled as A, B, C and D are identified correctly?

AIPMT 2010 Mains Biology - Biomolecules Question 75 English
A.
A B C D
Potential
energy		 Transition
state		 Activation
energy		 Activation energy
with out enzyme
B.
A B C D
Transition
state		 Potential
energy		 Activation energy
without enzyme		 Activation energy
with enzyme
C.
A B C D
Potential
energy		 Transition
state		 Activation energy
with enzyme		 Activation energy
without enzyme
D.
A B C D
Activation energy
with enzyme		 Transition
state		 Activation energy
without enzyme		 Potential
energy
2010 NEET MCQ
AIPMT 2010 Mains
Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
A.
Enzymes require optimum pH for maximal activity.
B.
Enzymes are denaturated at high temperature but in certain exceptional organisms they are effective even at temperatures 80o - 90oC.
C.
Enzymes are highly specific.
D.
Most enzymes are proteins but some are lipids.
2008 NEET MCQ
AIPMT 2008
Modern detergents contain enzyme preparations of
A.
thermoacidophiles
B.
thermophiles
C.
acidophiles
D.
alkaliphiles.
2008 NEET MCQ
AIPMT 2008
A competitive inhibitor of succinic dehydrogenase is
A.
$\alpha $-ketoglutarate
B.
Malate
C.
malonate
D.
oxaloacetate.
2008 NEET MCQ
AIPMT 2008
Carbohydrates are commonly found as starch in plants storage organs. Which of the following five properties of starch (1 $-$ 5) make it useful as a storage material?
(1)  Easily translocated
(2)  Chemically non-reactive
(3)  Easily digested by animals
(4)  Osmotically inactive
(5)  Synthesized during photosynthesis
The useful properties are
A.
(1), (3) and (5)
B.
(1) and (5)
C.
(2) and (3)
D.
(2) and (4).
2008 NEET MCQ
AIPMT 2008
Cellulose is the major component of cell walls of
A.
Pseudomonas
B.
Saccharomyces
C.
Pythium
D.
Xanthomonas.
2007 NEET MCQ
AIPMT 2007
About 98 percent of the mas of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
A.
sulphur and magnesium
B.
magnesium and sodium
C.
calcium and phosphorus
D.
phosphorus and sulphur.
2006 NEET MCQ
AIPMT 2006
An organic substance bound to an enzyme and essential for its activity is called
A.
isoenzyme
B.
coenzyme
C.
holoenzyme
D.
apoenzyme.
2005 NEET MCQ
AIPMT 2005
Which one of the following statements regarding enzyme inhibition is correct?
A.
Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein.
B.
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme.
C.
Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate.
D.
Non-competitive inhibitors often bind to the enzyme irreversibly.
2005 NEET MCQ
AIPMT 2005
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
A.
base-sugar-phosphate
B.
base-sugar-OH
C.
(base-sugar-phosphate)
D.
sugar-phosphate
2005 NEET MCQ
AIPMT 2005
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
A.
help in regulating metabolism
B.
are exclusively synthesized in the body of a living organism as at present
C.
are conjugated proteins
D.
enhance oxidative metabolism.
2005 NEET MCQ
AIPMT 2005
The catalytic efficiency of two different enzymes can be compared by the
A.
formation of the product
B.
pH of optimum value
C.
Km value
D.
molecular size of the enzyme.
2005 NEET MCQ
AIPMT 2005
Which of the following is the simplest amino acid?
A.
Alanine
B.
Asparagine
C.
Glycine
D.
Tyrosine
2005 NEET MCQ
AIPMT 2005
Carbohydrates, the most abundant biomolescule on earth, are produced by
A.
some bacteria, algae and green plant cells
B.
fungi, algae and green plant cells
C.
all bacteria, fungi and algae
D.
viruses, fungi and bacteria.
2004 NEET MCQ
AIPMT 2004
Which one of the following enzymes, is copper necessarily associated as an activator?
A.
Carbonic anhydrase
B.
Tryptophanase
C.
Lactic dehydrogenase
D.
Tyrosinase
2003 NEET MCQ
AIPMT 2003
The major role of minor elements inside living organisms is to act as
A.
co-factors of enzymes
B.
building blocks of important amino acids
C.
constituent of hormones
D.
binder of cell structure.
2002 NEET MCQ
AIPMT 2002
Lipids are insoluble in water because lipid molecules are
A.
hydrophilic
B.
hydrophobic
C.
neutral
D.
zwitter ions.
2002 NEET MCQ
AIPMT 2002
Which of the following is a reducing sugar?
A.
Galactose
B.
Gluconic acid
C.
$\beta $-methyl galactoside
D.
Sucrose
2001 NEET MCQ
AIPMT 2001
Enzyme first used for nitrogen fixation
A.
nitrogenaase
B.
nitroreductase
C.
transferase
D.
transaminase
2000 NEET MCQ
AIPMT 2000
Which of the following have carbohydrate as prosthetic group?
A.
Glycoprotein
B.
Chromoprotein
C.
Lipoprotein
D.
Nucleoprotein
2000 NEET MCQ
AIPMT 2000
Which factor is responsible for inhibition of enzymatic process during feedback?
A.
Substrate
B.
enzymes
C.
End product
D.
Temperature
2000 NEET MCQ
AIPMT 2000
ATP is
A.
nucleotide
B.
nucleoside
C.
nucleic acid
D.
vitamin.