VITAMINS AND COENZYMES QUIZ

Lipoic acid is a co-factor of the

pyruvic dehydrogenase

both (a) and (b)

α-ketoglutaric dehydrogenase

di-hydroorotate dehydrogenase

TRUE ANSWER : ?
YOUR ANSWER : ?

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

plants

animal

none of these

plants and animals both

TRUE ANSWER : ?
YOUR ANSWER : ?

An example of a digestive hormone is

lipase

pepsin

gastrin

amylase

TRUE ANSWER : ?
YOUR ANSWER : ?

An early sign of retinol deficiencies in man is

none of these

xeropthalmia

night blindness

keratinization

TRUE ANSWER : ?
YOUR ANSWER : ?

Vitamin B12 (Cobalamin) is only synthesized by

micro-organisms

fishes

plants

animals

TRUE ANSWER : ?
YOUR ANSWER : ?

In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

5-6 dimethylbenzimidazole

hydroxycobalamin

cyanocobalamin

adenine

TRUE ANSWER : ?
YOUR ANSWER : ?

Who discovered vitamin C (ascorbic acid)?

Albert Szent-Gyorgyi

Kerry Mull is

Paul Berg

Linus Pauling

TRUE ANSWER : ?
YOUR ANSWER : ?

Dihydroorotate dehydrogenase contains

4 flavins and 2 atoms of iron per molecule

4 flavins and 4 atoms of iron per molecule

2 flavins and 2 atoms of iron per molecule

2 flavins and 4 atoms of iron per molecule

TRUE ANSWER : ?
YOUR ANSWER : ?

An enzyme, L-folate reductase reduces folic acid to

dihydrofolic acid

hydrofolic acid

tetrahydrofolic acid

trihydrofolic acid

TRUE ANSWER : ?
YOUR ANSWER : ?

Vitamins are essential because the organism

can't synthesize these compounds in the adequate amounts

can't synthesize these compounds at all

can synthesize these compounds partially

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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