VITAMINS AND COENZYMES QUIZ

Dihydroorotate dehydrogenase contains

4 flavins and 2 atoms of iron per molecule

2 flavins and 4 atoms of iron per molecule

4 flavins and 4 atoms of iron per molecule

2 flavins and 2 atoms of iron per molecule

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following compounds/(s) belong/(s) to the vitamin B6 group?

Pyridoxamine

Pyridoxine

Pyridoxal

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

What metal ion is specifically bound by vitamin B12?

Copper

Iron

Zinc

Cobalt

TRUE ANSWER : ?
YOUR ANSWER : ?

Lipoic acid exists in

reduced form

oxidized and reduced form both

oxidized form

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Ascorbic acid acts as an

None of these

oxidizing agent

reducing agent

oxidizing and reducing agent both

TRUE ANSWER : ?
YOUR ANSWER : ?

In one iron-metalloflavoprotein, the iron is present as a

nonheme type

flavin moiety

heme-protein

both (a) and (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

An enzyme, L-folate reductase reduces folic acid to

dihydrofolic acid

hydrofolic acid

trihydrofolic acid

tetrahydrofolic acid

TRUE ANSWER : ?
YOUR ANSWER : ?

Vitamins are essential because the organism

None of these

can't synthesize these compounds in the adequate amounts

can synthesize these compounds partially

can't synthesize these compounds at all

TRUE ANSWER : ?
YOUR ANSWER : ?

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

animal

plants and animals both

none of these

plants

TRUE ANSWER : ?
YOUR ANSWER : ?

A fat-soluble vitamin that regulates blood clotting is

niacin

vitamin A

vitamin C

vitamin K

TRUE ANSWER : ?
YOUR ANSWER : ?

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