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Vitamins and Coenzymes

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

Thiamine
Beta-Carotene
Cobalamin
Pyridoxine

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Vitamins and Coenzymes
Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

nine isoprene units
six isoprene units
four isoprene units
four isoprene units

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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

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

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

xeropthalmia
night blindness
keratinization
none of these

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Vitamins and Coenzymes
Lipoic acid exists in

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

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