19. Tyrosine is the precursor of many biological molecules. Which of the following molecules is derived from tyrosine?(A) Serotonin (B) Heme (C) Dopa (D) Spermidine (E) None of the above

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.

19. Tyrosine is the precursor of many biological molecules. Which of the following molecules is derived from tyrosine?
(A) Serotonin
(B) Heme
(C) Dopa
(D) Spermidine
(E) None of the above

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