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Biomolecules

194 Questions Start Allen Test
All Exams Allen
Q151 Allen (A) NCERT BASED QUESTIONS 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)
Q152 Allen (A) NCERT BASED QUESTIONS 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
Q153 Allen (A) NCERT BASED QUESTIONS 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
Q154 Allen (A) NCERT BASED QUESTIONS 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
Q155 Allen (A) NCERT BASED QUESTIONS 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
Q156 Allen (A) NCERT BASED QUESTIONS 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
Q157 Allen (A) NCERT BASED QUESTIONS 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
Q158 Allen (A) NCERT BASED QUESTIONS 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.
Q159 Allen (A) NCERT BASED QUESTIONS 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
Q160 Allen (A) NCERT BASED QUESTIONS 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
Q161 Allen (A) NCERT BASED QUESTIONS 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
Q162 Allen (A) NCERT BASED QUESTIONS 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
Q163 Allen (A) NCERT BASED QUESTIONS Match the Columns
Match the Column-I(Example) with Column-II(Type of cofactor) :-
Column-IColumn-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
Q164 Allen (A) NCERT BASED QUESTIONS 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
Q165 Allen (A) NCERT BASED QUESTIONS 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.
Q166 Allen (A) NCERT BASED QUESTIONS 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
Q167 Allen (A) NCERT BASED QUESTIONS 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
Q168 Allen (A) NCERT BASED QUESTIONS 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
Q169 Allen (A) NCERT BASED QUESTIONS 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)
Q170 Allen (B) ANALYTICAL QUESTIONS MCQ
Which element is present negligible in human body?
A.
O
B.
C
C.
H
D.
Si
Q171 Allen (B) ANALYTICAL QUESTIONS 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
Q172 Allen (B) ANALYTICAL QUESTIONS MCQ
Which of the following is not a macromolecule?
A.
Amino acid
B.
Nucleotide
C.
Monosaccharide
D.
All the above
Q173 Allen (B) ANALYTICAL QUESTIONS 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
Q174 Allen (B) ANALYTICAL QUESTIONS 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
Q175 Allen (B) ANALYTICAL QUESTIONS MCQ
What is the R group in Glycine?
A.
$–CH_2$–OH
B.
–H
C.
$–CH_3$
D.
None of them