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Vitamins and Coenzymes

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

dihydrofolic acid
trihydrofolic acid
hydrofolic acid
tetrahydrofolic acid

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

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

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Vitamins and Coenzymes
β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by

plants and animals both
animal
none of these
plants

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Vitamins and Coenzymes
The prosthetic group biotin is a carrier of which type of molecule?

Sulfhydryl group
Methyl group
Activated carbon dioxide (CO2)
Ammonia

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

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

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Vitamins and Coenzymes
Vitamins are essential because the organism

can't synthesize these compounds in the adequate amounts
None of these
can synthesize these compounds partially
can't synthesize these compounds at all

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