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Vitamins and Coenzymes

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

Pyridoxine
Thiamine
Cobalamin
Beta-Carotene

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

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

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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Vitamins and Coenzymes
Selenium is an essential component of the enzyme glutathione peroxidase which

oxidizes toxic hydoperoxycompounds in tissues
None of these
scavenges toxic hydoperoxycompounds in tissues
reduces toxic hydoperoxycompounds in tissues

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Vitamins and Coenzymes
A deficiency of thiamin produces the disease known as

beri-beri
cataract
anemia
scurvy

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

trihydrofolic acid
tetrahydrofolic acid
hydrofolic acid
dihydrofolic acid

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