VITAMINS AND COENZYMES QUIZ

Vitamins are essential because the organism

can't synthesize these compounds in the adequate amounts

can synthesize these compounds partially

can't synthesize these compounds at all

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these is a vitamin A precursor?

Pyridoxine

Beta-Carotene

Thiamine

Cobalamin

TRUE ANSWER : ?
YOUR ANSWER : ?

A deficiency of thiamin produces the disease known as

scurvy

anemia

beri-beri

cataract

TRUE ANSWER : ?
YOUR ANSWER : ?

The vitamin niacin is part of the __________ molecule.

pyrophosphate

ferredoxin

NAD+

pyridoxal phosphate

TRUE ANSWER : ?
YOUR ANSWER : ?

An enzyme, L-folate reductase reduces folic acid to

hydrofolic acid

dihydrofolic acid

trihydrofolic acid

tetrahydrofolic acid

TRUE ANSWER : ?
YOUR ANSWER : ?

Lipoic acid is a co-factor of the

both (a) and (b)

α-ketoglutaric dehydrogenase

pyruvic dehydrogenase

di-hydroorotate dehydrogenase

TRUE ANSWER : ?
YOUR ANSWER : ?

Biotin occurs mainly in combined forms bound to protein through

ε-S-lysine moiety

ε-N-biotinyl-L-lysine

ε-N-lipoyl - L-lysine

ε-N-lysine moiety

TRUE ANSWER : ?
YOUR ANSWER : ?

A deficiency of niacin causes

anemia

pellagra

scurvy

cataract

TRUE ANSWER : ?
YOUR ANSWER : ?

β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by

plants

plants and animals both

animal

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Ascorbic acid acts as an

oxidizing and reducing agent both

oxidizing agent

reducing agent

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

↑