Biochemistry Chapter 4,5,& 6 Test Bank Questions EXAM 2

The net charge of the zwitterion form of Gly is ___ - Zero When a peptide bond is formed, an ___ reacts with a carboxylate group - Amino Group At a pH above the pKa, the phenol group of tyrosine is - Deprotonated In the tripeptide Lys-Pro-Ile, there are ___ charged groups at pH 7 - Three at a pH below the pKa, the ε-amino group of lysine is - Protonated at a pH below the pKa, the β-carboxylate group of Asp is ___ - uncharged; Protonated In the peptide Trp-Ser-Val, valine is at the - C-terminus In the tripeptide Trp-Val-Phe, the N-terminal residue is ___ - tryptophan In the tripeptide Lys-Pro-Ile, the C-terminal residue is - Isoleucine Biological systems usually produce a single enantiomer, whereas chemical synthesis produces a ___ - racemic mixture GABA is a neurotransmitter derived from ___ - glutamat