VITAMINS AND COENZYMES QUIZ

A fat-soluble vitamin that regulates blood clotting is

niacin

vitamin K

vitamin A

vitamin C

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YOUR ANSWER : ?

What metal ion is specifically bound by vitamin B12?

Zinc

Copper

Iron

Cobalt

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

Pyridoxine

Pyridoxal

Pyridoxamine

All of these

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Which of these is a vitamin A precursor?

Cobalamin

Beta-Carotene

Thiamine

Pyridoxine

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The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

more deep in color on reduction with Zn in acid and regained its color on re-oxidation

more deep in color on oxidation and regained its color on reduction with Zn in acid

colorless on oxidation and regained its color on reduction with Zn in acid

colorless on reduction with Zn in acid and regained its color on re-oxidation

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

adenine

hydroxycobalamin

cyanocobalamin

5-6 dimethylbenzimidazole

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The vitamin niacin is part of the __________ molecule.

pyridoxal phosphate

pyrophosphate

ferredoxin

NAD+

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Selenium is an essential component of the enzyme glutathione peroxidase which

scavenges toxic hydoperoxycompounds in tissues

reduces toxic hydoperoxycompounds in tissues

None of these

oxidizes toxic hydoperoxycompounds in tissues

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Who discovered vitamin C (ascorbic acid)?

Paul Berg

Linus Pauling

Albert Szent-Gyorgyi

Kerry Mull is

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A deficiency of niacin causes

scurvy

pellagra

cataract

anemia

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