18. Which of the following amino acid residue is the precursor of glutathione?(A) Cys (B) Gly (C) Met (D) A&B (E) A&C

7. DNA double helix structure is stabilized by all of the following EХСЕРТ:(A) the sugar-phosphate backbones are oriented in opposite directions.(B) the glycosidic bonds holding paired bases are directly across the helix from one another.(C) cations such as Mg2+ bind to the anionic phosphates.(D) bases stack together through hydrophobic interactions and van der Waals forces.(E) appropriate base pairing builds a polymer whose external dimensions are uniform.

18. Which of the following amino acid residue is the precursor of glutathione?
(A) Cys
(B) Gly
(C) Met
(D) A&B
(E) A&C

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