VITAMINS AND COENZYMES QUIZ

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

cyanocobalamin

hydroxycobalamin

5-6 dimethylbenzimidazole

adenine

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of these is a vitamin A precursor?

Pyridoxine

Beta-Carotene

Thiamine

Cobalamin

TRUE ANSWER : ?
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Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

four isoprene units

six isoprene units

nine isoprene units

four isoprene units

TRUE ANSWER : ?
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β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by

plants and animals both

animal

plants

none of these

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Who discovered vitamin C (ascorbic acid)?

Albert Szent-Gyorgyi

Paul Berg

Kerry Mull is

Linus Pauling

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Which of these hormones is a catecholamine?

Follitropin

Tetraiodothyronine

Norepinephrine

Tetrahydrofolate

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

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

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

colorless 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

TRUE ANSWER : ?
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Lipoic acid is a co-factor of the

both (a) and (b)

di-hydroorotate dehydrogenase

α-ketoglutaric dehydrogenase

pyruvic dehydrogenase

TRUE ANSWER : ?
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The occurrence of metals such as iron or molybdenum in some flavoproteins can

form chelation

de-stabilize the semiquinone

all of these

stabilize the semiquinone

TRUE ANSWER : ?
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The symptoms of retinol excess are

nausea

all of these

weakness

bone fragility

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