chap19 - Chapter 19 Amino Acids and Proteins 19.1...

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Chapter 19 Amino Acids and Proteins 19.1 Multiple - Choice Questions 1) Which of the following is NOT a function of proteins? A) provide structural components B) stores the genetic information of a living organism C) movement of muscles D) catalyze reactions in the cells E) transport substances through the bloodstream Answer: B 2) Collagen, a protein found in tendons and cartilage, would be classified as a ________ protein. A) catalytic B) structural C) transport D) storage E) hormone Answer: B 3) Sucrase, the protein that facilitates the hydrolysis of sucrose, would be classified as a ________ protein. A) transport B) hormonal C) catalytic D) structural E) contractile Answer: C 4) The structural formulas of amino acids are the same EXCEPT for the A) carboxyl group. B) alpha carbon. C) amino group. D) side (R) group. E) hydrogen bonding. Answer: D 5) The following amino acid side chain is - C| HCH3 CH3 A) polar. B) hydrophobic. C) hydrophilic. D) acidic. E) basic. Answer: B Page 254 6) Which of the following would be most likely to be deficient in at least one essential amino acid? A) eggs B) milk C) beans D) steak E) ham Answer: C 7) Amino acids that are not synthesized in the body and must be obtained from the diet are called A) essential. B) polar. C) nonpolar. D) complete. E) incomplete. Answer: A 8) The R group for serine is - CH2OH. As a zwitterion, serine has the structural formula A) CH2OH NH2
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C HCOOH B) CH2OH NH2 C HCOOC) CH2O - + N H3 C HCOOH D) CH2OH + N H3 C HCOOH E) CH2OH + N H3 C HCOOAnswer: E Page 255 9) Which of the following functional groups of an amino acid would be in the ionized state at high pH? A) O - COH B) - CH2OH C) - CH3 D) O - CNH2 E) Answer: A Page 256 10) Which of the following is the correct structure for Ser - Ala - Asp? The appropriate side chains look like this. O Ala: - CH3; Ser: - CH2OH; Asp: - CH2COH A) OH COOH CH3 O | CH2 O | CH2 O H3 N + C H - C - NH - C H - C - NH - C H - C O - B) COOH OH
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| | CH2 O CH3 O CH2 O H3 N + C H - C - NH - C H - C - NH - C H - C OC) OH COOH | | CH2 O CH2O CH3 O H3 N + C H - C - NH - C H - C - NH - C H - C OD) COOH OH | | CH2 O CH2 O CH3 O H3 N + C H - C - NH - C H - C - NH - C H - C OE) OH COO - | | CH2O CH3 O CH2 O H3 N + C H - C - NH - C H - C
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- NH - C H - C OAnswer: E 11) The peptide bonds that combine amino acids in a protein are A) ester bonds. B) ether bonds. C) amide bonds. D) glycosidic bonds. E) sulfide bonds. Answer: C Page 257 12) The bonds that are important in the secondary structure of a protein are A) hydrogen bonds. B) hydrophobic interactions. C) disulfide bonds.
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This note was uploaded on 12/18/2011 for the course CHEMISTRY 0012 taught by Professor Wester during the Fall '10 term at St. Thomas FL.

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chap19 - Chapter 19 Amino Acids and Proteins 19.1...

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