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Vitamins and Coenzymes

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

Cobalamin
Beta-Carotene
Pyridoxine
Thiamine

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Vitamins and Coenzymes
Vitamin-D deficiency can cause

cataract
pernicious anemia
beri-beri
rickets

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Vitamins and Coenzymes
The absence of ascorbic acid in the human diet gives rise to

cataract
pernicious anemia
beri-beri
rickets

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

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

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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Vitamins and Coenzymes
Vitamins are essential because the organism

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

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