24. What is the main stabilizing force in the secondary structure of proteins
(A) peptide bond.
(B) hydrogen bond.
(C) disulfide bond.
(D) hydrophobic bond.

25. What is one unit of urea biosynthesized from? (A) two units of and one unit of CO2. (B) one unit of as well as one unit of carboxyl and amino groups of arginine. (C) one unit of , one carboxyl group of aspartate, and one unit of amino group of arginine. (D) one unit of , one carboxyl group of arginine, and one unit of amino group of aspartate. (E) one unit of , one unit of CO2 and one unit of amino group of aspartate.

26. Arginine is considered _____(A) Glycogenic. (B) Ketogenic. (C) Glycogenic and ketogenic. (D) Neither glycogenic nor ketogenic. (E) None of above.

27. Tryptophan is considered _____(A) Glycogenic. (B) Ketogenic. (C) Glycogenic and ketogenic. (D) Neither glycogenic nor ketogenic. (E) None of above.

28. A deficiency of the following enzyme can lead to phenylketonuria (A) Tyrosinase. (B) Creatine synthase. (C) Phenylalanine hydroxylase. (D) Phenylalanine (E) Cystathionine lyase.

29. Which set of compounds listed below can serve as precursors for heme? (A) Gly, succinyl-CoA. (B) Gily, propionyl-CoA. (C) Gly, acetic acid. (D) Biliverdin, CO, Fe. (E) Bilirubin, CO, Fe. (F) Gly, biliveridin.

30. Myoglobin and the subunits of hemoglobin have: (A) no obvious structural relationship. (B) very different primary and tertiary structures. (C) very similar primary and tertiary structures. (D) very similar primary structures, but different tertiary structures. (E) very similar tertiary structures, but different primary structures.

31. Which of the following lipids is not a saturated fatty acid? (A) lauric acid (B) linoleic acid. (C) myristic acid. (D) stearic acid. (E) arachidic acid.

32. Which of the following best describes the cholesterol molecule? (A) Nonpolar, charged. (B) Nonpolar, uncharged. (C) Amphipathic. (D) Polar, charged. (E) Polar, uncharged.

33. The primary storage form of lipid is _____ and it is normally stored in the _____. (A) Phospholipid； liver. (B) cholesterol； muscles. (C) monoacylglycerol； adipocytes (D) triacylglycerols； adipocytes. (E) triacylglycerols； liver.

34. Which of the following molecules or substances contain, or are derived from, fatty acids? (A) sphingolipids. (B) prostaglandins. (C) beeswax. (D) prostaglandins and sphingolipids (E) prostaglandins、sphingolipids and beeswax.

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