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Vitamins and Coenzymes

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

Ammonia
Activated carbon dioxide (CO2)
Sulfhydryl group
Methyl group

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

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

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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
An enzyme, L-folate reductase reduces folic acid to

trihydrofolic acid
dihydrofolic acid
hydrofolic acid
tetrahydrofolic acid

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

antioxidants
all of these
oxidizing agent
reducing agent

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Vitamins and Coenzymes
The disease Beriberi is due to a dietary deficiency in

vitamin B12
vitamin B1 (thiamine)
vitamin B2 (riboflavin)
vitamin B6 (pyridoxine)

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