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Vitamins and Coenzymes

Vitamins and Coenzymes
What metal ion is specifically bound by vitamin B12?

Copper
Iron
Cobalt
Zinc

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Vitamins and Coenzymes
Vitamin B12 (Cobalamin) is only synthesized by

fishes
micro-organisms
plants
animals

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Vitamins and Coenzymes
The occurrence of metals such as iron or molybdenum in some flavoproteins can

de-stabilize the semiquinone
all of these
form chelation
stabilize the semiquinone

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Vitamins and Coenzymes
An enzyme, L-folate reductase reduces folic acid to

trihydrofolic acid
hydrofolic acid
dihydrofolic acid
tetrahydrofolic acid

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Vitamins and Coenzymes
A deficiency of niacin causes

anemia
pellagra
cataract
scurvy

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

ATP and GTP
NADH and FADH2
Coenzyme A and ubiquinone
NAD+ and FAD

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MORE MCQ ON Vitamins and Coenzymes

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