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Vitamins and Coenzymes

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

plants
animals
fishes
micro-organisms

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Vitamins and Coenzymes
Ascorbic acid acts as an

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

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Vitamins and Coenzymes
The absence of ascorbic acid in the human diet gives rise to

beri-beri
cataract
pernicious anemia
rickets

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

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

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Vitamins and Coenzymes
Biotin occurs mainly in combined forms bound to protein through

ε-N-lysine moiety
ε-S-lysine moiety
ε-N-lipoyl - L-lysine
ε-N-biotinyl-L-lysine

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

trihydrofolic acid
dihydrofolic acid
tetrahydrofolic acid
hydrofolic acid

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