36. A fat-soluble vitamin that regulates blood clotting is

A. vitamin A
B. vitamin K
C. vitamin C
D. niacin

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37. Which of these is a vitamin A precursor?

A. Cobalamin
B. Pyridoxine
C. Beta-Carotene
D. Thiamine

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38. In one iron-metalloflavoprotein, the iron is present as a

A. heme-protein
B. nonheme type
C. both (a) and (b)
D. flavin moiety

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39. Vitamin K₁ was first isolated from alfalalfa and has the phytyl side chain consisting of

A. four isoprene units
B. six isoprene units
C. nine isoprene units
D. four isoprene units

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40. Which of these molecules is vitamin H?

A. Biotin
B. Carnitine
C. Folic acid
D. None of these

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