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Vitamins and Coenzymes

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

plants
animal
none of these
plants and animals both

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Vitamins and Coenzymes
Vitamin B12 is useful in the prevention and treatment of

scurvy
cataract
beri-beri
pernicious anemia

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Vitamins and Coenzymes
An early sign of retinol deficiencies in man is

none of these
keratinization
xeropthalmia
night blindness

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Vitamins and Coenzymes
The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin

B12(Co) to B12(Co2+)
B12(Co+)to B12(Co2+)
B12(Co2+)to B12(Co+)
B12(Co2+)to B12(Co)

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

tetrahydrofolic acid
trihydrofolic acid
hydrofolic acid
dihydrofolic acid

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Vitamins and Coenzymes
Vitamin-C is considered as a

fat and water soluble
water soluble
none of these
fat soluble

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