Which of the 20 Standard Amino Acids Is Optically Inactive

Q20: The only observable regular secondary structures

Q21: Serine has a _ side chain; valine

Q22: At a pH above its pK_a,

Q23: The formation of a dipeptide from

Q24: The following is an example of

Q26: Which of the following best describes

Q27: Disulfide bonds form between two residues of

Q28: What level of protein structure is characterized

Q29: Heme is considered a _.<br>A) catalyst<br>B) prosthetic

Q30: When a peptide bond forms, an _