VITAMINS AND COENZYMES QUIZ

Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

either end via a single disulfide bond

both ends by one disulfide bond

either end via two disulfide bonds

both ends by two disulfide bonds

TRUE ANSWER : ?
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A deficiency of thiamin produces the disease known as

cataract

beri-beri

scurvy

anemia

TRUE ANSWER : ?
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Selenium is an essential component of the enzyme glutathione peroxidase which

oxidizes toxic hydoperoxycompounds in tissues

scavenges toxic hydoperoxycompounds in tissues

None of these

reduces toxic hydoperoxycompounds in tissues

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Who discovered vitamin C (ascorbic acid)?

Paul Berg

Kerry Mull is

Albert Szent-Gyorgyi

Linus Pauling

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

flavin moiety

heme-protein

both (a) and (b)

nonheme type

TRUE ANSWER : ?
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The absence of ascorbic acid in the human diet gives rise to

rickets

beri-beri

pernicious anemia

cataract

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Biotin occurs mainly in combined forms bound to protein through

ε-N-lipoyl - L-lysine

ε-N-biotinyl-L-lysine

ε-S-lysine moiety

ε-N-lysine moiety

TRUE ANSWER : ?
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Which of the following are reduced coenzymes?

NADH and FADH2

Coenzyme A and ubiquinone

ATP and GTP

NAD+ and FAD

TRUE ANSWER : ?
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The most prominent role that tocopherol has in in-vitro systems is as a strong

reducing agent

antioxidants

oxidizing agent

all of these

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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

cyanocobalamin

hydroxycobalamin

5-6 dimethylbenzimidazole

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YOUR ANSWER : ?

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