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Vitamins and Coenzymes

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

fishes
animals
micro-organisms
plants

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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
four isoprene units
six isoprene units
four isoprene units

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Vitamins and Coenzymes
Biotin occurs mainly in combined forms bound to protein through

ε-N-lipoyl - L-lysine
ε-N-biotinyl-L-lysine
ε-S-lysine moiety
ε-N-lysine moiety

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

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

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

Iron
Copper
Zinc
Cobalt

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Vitamins and Coenzymes
Which of these molecules is vitamin H?

Folic acid
Carnitine
None of these
Biotin

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MORE MCQ ON Vitamins and Coenzymes

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