17. Human cells begin cell proliferation by entering the cell cycle. Which phase of the cell cycle will be stopped if the cells are treated with a drug that decreases the levels of cyclin B1? (2.5 points)(A)G0(B)G1(C)S(D)G2/M

22. Which one is incorrect? (2.5 points)(A)Vitamins are often precursors to coenzymes.(B)Vitamins are small biomolecules that are needed in small amounts in the diets of higher animals.(C)The water-soluble vitamins are vitamin C (ascorbate, an antioxidant) and the vitamin B complex (components of coenzymes).(D)Ascorbate is required for the hydroxylation of proline residues in collagen, a key protein of connective tissue.(E)The water-soluble vitamins are vitamin A (a precursor of retinal), D (a regulator of calcium and phosphorus metabolism), E (an antioxidant in membranes), and K (a participant in the carboxylation of glutamate).

17. Human cells begin cell proliferation by entering the cell cycle. Which phase of the cell cycle will be stopped if the cells are treated with a drug that decreases the levels of cyclin B1? (2.5 points)

(A)G0

(B)G1

(C)S

(D)G2/M

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