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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
Lipoic acid exists in

none of these
reduced form
oxidized and reduced form both
oxidized form

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

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

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Vitamins and Coenzymes
Vitamin B12 (Cobalamin) is only synthesized by

micro-organisms
animals
fishes
plants

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Vitamins and Coenzymes
A deficiency of niacin causes

pellagra
cataract
scurvy
anemia

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Vitamins and Coenzymes
Vitamins are essential because the organism

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

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