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Vitamins and Coenzymes

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

plants
animals
micro-organisms
fishes

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Vitamins and Coenzymes
In one iron-metalloflavoprotein, the iron is present as a

both (a) and (b)
heme-protein
flavin moiety
nonheme type

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Vitamins and Coenzymes
Ascorbic acid acts as an

oxidizing agent
reducing agent
None of these
oxidizing and reducing agent both

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

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

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Vitamins and Coenzymes
Lipoic acid is a co-factor of the

di-hydroorotate dehydrogenase
α-ketoglutaric dehydrogenase
both (a) and (b)
pyruvic dehydrogenase

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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MORE MCQ ON Vitamins and Coenzymes

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