Q51
Allen
ENZYMES
MCQ
First discovered Enzyme was :-
A.
Isomerase
B.
Transaminase
C.
Zymase
D.
Transferase
Q52
Allen
ENZYMES
MCQ
Enzyme were discovered for the first time by:
A.
Sumner
B.
Buchner
C.
Kuhne
D.
None of the above
Q53
Allen
ENZYMES
MCQ
Who coined the term enzyme ?
A.
Pasteur
B.
Buchner
C.
Kuhne
D.
Sumner
Q54
Allen
ENZYMES
MCQ
Vitamin serves the function of :-
A.
An enzyme
B.
A coenzyme
C.
A holoenzyme
D.
A hormone
Q55
Allen
ENZYMES
MCQ
Which of the following is a coenzyme ?
A.
NAD
B.
NADP
C.
FAD
D.
All the above
Q56
Allen
ENZYMES
MCQ
The Coenzyme is -
A.
often a metal
B.
often a vitamin
C.
always a protein
D.
always an inorganic compound B
Q57
Allen
ENZYMES
MCQ
Which of the following is produced with the combination of apoenzyme and coenzyme-
A.
ES complex
B.
Prosthetic gp
C.
Holoenzyme
D.
EP complexās
Q58
Allen
ENZYMES
MCQ
Which of the following coenzyme is a derivative of Niacin ?
A.
NAD
B.
NADP
C.
FAD
D.
Both (1) and (2)
Q59
Allen
ENZYMES
MCQ
Which of the following is not consumed in a biochemical process ?
A.
Hormones
B.
Enzymes
C.
Vitamins
D.
Nucleotides
Q60
Allen
ENZYMES
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
Q61
Allen
ENZYMES
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
Q62
Allen
ENZYMES
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
Q63
Allen
ENZYMES
MCQ
Enzyme have very narrow optima for :-
A.
Light
B.
Temperature
C.
pH
D.
Humidity
Q64
Allen
ENZYMES
MCQ
Which enzyme is not a protein ?
A.
Hexokinase
B.
Synthetase
C.
Endonuclease
D.
Ribozyme
Q65
Allen
ENZYMES
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.
Q66
Allen
ENZYMES
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
Q67
Allen
ENZYMES
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
Q68
Allen
ENZYMES
MCQ
An organic substance bound to an enzyme and essential for its activity is called
A.
Apoenzyme
B.
Isoenzyme
C.
Coenzyme
D.
Holoenzyme
Q69
Allen
ENZYMES
MCQ
A competitive inhibitor of succinic dehydrogenase is :-
A.
Ī±-ketoglutarate
B.
Malate
C.
Malonate
D.
Oxaloacetate
Q70
Allen
ENZYMES
MCQ
For its activity, carboxypeptidase requires :-
A.
Niacin
B.
Copper
C.
Zinc
D.
Iron
Q71
Allen
ENZYMES
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
Q72
Allen
ENZYMES
MCQ
The essential chemical components of many coenzymes are :
A.
Vitamins
B.
Proteins
C.
Nucleic acids
D.
Carbohydrates
Q73
Allen
ENZYMES
MCQ
Enzyme catalysing the linking together of 2 compounds :-
A.
Lyases
B.
Transferases
C.
Hydrolases
D.
Ligases
Q74
Allen
PYQ
MCQ
Which one of the following is a non - reducing carbohydrate ?
A.
Maltose
B.
Sucrose
C.
Lactose
D.
Ribose
Q75
Allen
PYQ
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