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Vitamins and Coenzymes

Vitamins and Coenzymes
The most prominent role that tocopherol has in in-vitro systems is as a strong

reducing agent
antioxidants
all of these
oxidizing agent

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Vitamins and Coenzymes
Vitamins are essential because the organism

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

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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
Lipoic acid is a co-factor of the

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

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

dihydrofolic acid
hydrofolic acid
trihydrofolic acid
tetrahydrofolic acid

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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