methionine and cysteine methionine and serine threonine and serine.Ĥ. They are: A) B) C) D) E)Ĭysteine and serine. Amino acids Page: 79 Difficulty: 1 Ans: C Two amino acids of the standard 20 contain sulfur atoms. A) B) C) D) E)Īlanine is a simple methyl group glycine is a hydrogen atom glycine is unbranched lysine contains only nitrogen proline forms a covalent bond with the amino groupģ. Amino acids Page: 76 Difficulty: 2 Ans: B Of the 20 standard amino acids, only _ is not optically active. is in the L absolute configuration in naturally occurring proteins. is bonded to four different chemical groups. Amino acids Page: 76 Difficulty: 1 Ans: C The chirality of an amino acid results from the fact that its α carbon: A) B) C) D) E) Chapter 3 Amino Acids, Peptides, and Proteins Multiple Choice Questions 1.
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