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Vitamins and Coenzymes

Vitamins and Coenzymes
What metal ion is specifically bound by vitamin B12?

Copper
Iron
Cobalt
Zinc

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Vitamins and Coenzymes
An early sign of retinol deficiencies in man is

night blindness
none of these
keratinization
xeropthalmia

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Vitamins and Coenzymes
Lipoic acid is a co-factor of the

pyruvic dehydrogenase
α-ketoglutaric dehydrogenase
both (a) and (b)
di-hydroorotate dehydrogenase

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

2 flavins and 4 atoms of iron per molecule
4 flavins and 2 atoms of iron per molecule
4 flavins and 4 atoms of iron per molecule
2 flavins and 2 atoms of iron per molecule

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

Thiamine
Pyridoxine
Cobalamin
Beta-Carotene

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Vitamins and Coenzymes
An example of a digestive hormone is

lipase
pepsin
gastrin
amylase

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