Vitamins and Coenzymes – Section 1

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

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

Correct Answer: B. vitamin K

37. Which of these is a vitamin A precursor?

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

Correct Answer: C. Beta-Carotene

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

Correct Answer: A. heme-protein

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

Correct Answer: A. four isoprene units

40. Which of these molecules is vitamin H?

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

Correct Answer: A. Biotin

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