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Vitamins and Coenzymes

Vitamins and Coenzymes
Ascorbic acid acts as an

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

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Vitamins and Coenzymes
Vitamins are essential because the organism

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

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

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

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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Vitamins and Coenzymes
Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

four isoprene units
nine isoprene units
six isoprene units
four isoprene units

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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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