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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of these is a vitamin A precursor?

Pyridoxine
Thiamine
Beta-Carotene
Cobalamin

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Vitamins and Coenzymes
The vitamin niacin is part of the __________ molecule.

NAD+
pyridoxal phosphate
pyrophosphate
ferredoxin

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

dihydrofolic acid
tetrahydrofolic acid
hydrofolic acid
trihydrofolic acid

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Vitamins and Coenzymes
Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

either end via two disulfide bonds
either end via a single disulfide bond
both ends by one disulfide bond
both ends by two disulfide bonds

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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
six isoprene units
nine isoprene units
four isoprene units

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

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

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