Coenzymes Quiz
Authored by Dr. A
Health Sciences
University
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A coenzyme is best described as:
A structural protein that forms part of an enzyme's active site.
A non-proteinaceous molecule that permanently binds to an enzyme.
An organic molecule that transiently binds to an enzyme to facilitate a reaction, acting as a helper molecule.
An inorganic ion that directly catalyses a biochemical reaction.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The term 'apoenzyme' refers specifically to:
A fully functional enzyme with all necessary cofactors bound.
An enzyme that is catalytically inactive due to the absence of its required coenzyme or cofactor.
A coenzyme molecule that has been separated from its enzyme.
An enzyme that is undergoing denaturation.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Coenzymes participate in enzyme catalysis by:
Directly lowering the activation energy of a reaction.
Acting as intermediate carriers of specific atoms or groups of atoms that are transferred during a reaction.
Stabilising the enzyme-substrate complex through ionic bonds.
Providing the necessary energy for the reaction to occur.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A holoenzyme is formed when:
An enzyme is denatured by a change in pH or temperature.
An apoenzyme binds with its specific coenzyme, thus becoming catalytically active.
An enzyme undergoes phosphorylation, becoming deactivated.
A substrate molecule binds to an enzyme.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following coenzymes is NOT primarily derived from a B vitamin?
Thiamine pyrophosphate (TPP).
Flavin mononucleotide (FMN).
Adenosine triphosphate (ATP).
Coenzyme A (CoA).
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the conversion of pyruvate to acetyl-CoA, which coenzyme plays a direct role in the decarboxylation step?
FAD
NAD+
Thiamine pyrophosphate (TPP).
Lipoic acid (LA)
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The synthesis of Coenzyme A (CoA) in the body depends on the availability of:
Vitamin B1 (Thiamine).
Vitamin B2 (Riboflavin).
Vitamin B5 (Pantothenic acid).
Vitamin B3 (Niacin)
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