CHAPTER 3 HOMEWORK 1. D and L alanine are: a) enantiomers b) diastereomers c) constitutional isomers d) not isomers 2. Which of these amino acids does NOT have an –OH group in its side chain? A) Ser...

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CHAPTER 3 HOMEWORK 1. D and L alanine are: a) enantiomers b) diastereomers c) constitutional isomers d) not isomers 2. Which of these amino acids does NOT have an –OH group in its side chain? A) Ser b) Thr c) Tyr d) Phe 3. Which of these amino acids contains an amide group? A) Ala b) Asp c) Asn d) Lys 4. L-Leu and L-Ile are: a) enantiomers b) diastereomers c) constitutional isomers d) not isomers 5. Which of these amino acids would have a positive charge at pH 7? A) Asp b) Ala c) Arg d) Val 6. Which of these amino acids would have a positive charge at pH 7? A) Asp b) Ala c) Arg d) Val 7. If one adds an –OH group to the p-position of the phenyl group in Phe, they get which amino acid? A) Trp b) Tyr c) Pro d) His 8. The amino acid in which the side chain is partially protonated at pH 7 is: A) Trp b) Tyr c) Pro d) His 9. The amino acid which contains 4 nitrogen atoms is: a) Lys b) His c) Asn d) Arg 10. Which of these amino acids contains sulfur? A) Leu b) Met c) Val d) Ile 11. Which amino acid is achiral? A) Gly b) Pro c) His d) Trp 12. Which amino acid has its entire side chain incorporated into a ring structure? A) F b) W c) P d) H 13. Which amino acid has the molecular formula C5H11NO2? A) A b) V c) L d) N 14. Which amino acid has a molar mass of about 89 grams per mole? A) A b) S c) V d) T 15. Which of these amino acids is most hydrophobic? A) S b) T c) K d) L