ch04 - Chapter 4: Amino Acids Matching A) B) C) D) E) F) G)...

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Chapter 4: Amino Acids Matching A) uncharged B) deprotonated C) three D) b-amino group E) two F) C-terminus G) lysine H) racemic mixture I) zero J) protonated K) isoleucine L) tryptophan M) phenylalanine 1. When a peptide bond is formed, an ______ reacts with a carboxylate group. Ans: D Section: 4.1.B Level of Difficulty: Easy Learning objective: Amino Acid Structure 2. In the peptide Trp-Ser-Val, valine is at the ______. Ans: F Section: 4.1.E Level of Difficulty: Easy Learning objective: Amino Acid Structure 3. At a pH above its p K , the phenolic group of tyrosine is ______. Ans: B Section: 4.1.C Level of Difficulty: Easy Learning objective: Amino Acid Structure
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4. At a pH below its p K , the -amino group of lysine is ______. Ans: J Section: 4.1.D Level of Difficulty: Easy Learning objective: Amino Acid Structure 5. At a pH below its p K , the -carboxylate group of Asp is ______. Ans: A or J Section: 4.1.D Level of Difficulty: Easy Learning objective: Amino Acid Structure 6. The net charge of the zwitterion form of Gly is ______. Ans: I Section: 4.1.A Level of Difficulty: Easy Learning objective: Amino Acid Structure 7. Biological systems usually produce a single enantiomer, whereas chemical synthesis produces a ______. Ans: H Section: 4.2 Level of Difficulty: Easy Learning objective: Amino Acid Structure 8. In the tripeptide Trp-Val-Phe, the N-terminal residue is ______. Ans: L Section: 4.1.E Level of Difficulty: Easy Learning objective: Amino Acid Structure 9. In the tripeptide Lys-Pro-Ile, the C-terminal residue is _________. Ans: K Section: 4.1.E Level of Difficulty: Easy
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Amino Acid Structure 10. In the tripeptide Lys-Pro-Ile, there are ______ charged groups at pH 7. Ans: C Section: 4.1.C Level of Difficulty: Easy Learning objective: Amino Acid Structure Multiple Choice 11. Which of the following amino acids has a charged polar side chain at pH 7? A) Leu B) Ala C) Met D) Trp E) Glu Ans: E Section: 4.1.C Level of Difficulty: Easy Learning objective: Amino Acid Structure 12. Which of the following amino acids has a sulfur atom in its side chain? A) Asn B) Ser C) Phe D) Met E) Tyr Ans: D Section: 4.1.C Level of Difficulty: Easy Learning objective: Amino Acid Structure 13. Which of the following amino acids has an uncharged polar side chain at pH 7? A)
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ch04 - Chapter 4: Amino Acids Matching A) B) C) D) E) F) G)...

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