At a pH below its pKa, the ?-amino group of lysine is Glutathione is a tripeptide containing a central ____ Residue GABA is a neurotransmitter derived from Biological systems usually produce a single enantiomer, whereas chemical synthesis produces a In the tripeptide Lys-Pro-Ile, the C-terminal residue is In the tripeptide Trp-Val-Phe, the N-terminal residue is In the peptide Trp-Ser-Val, valine is at the At a pH below its pKa, the β-carboxylate group of Asp is In the tripeptide Lys-Pro-Ile, there are ______ charged groups at pH 7

1. At a pH below its pKa, the ?-amino group of lysine is

Protonated

2. Glutathione is a tripeptide containing a central ____ Residue

cysteine

3. GABA is a neurotransmitter derived from

Glutamate

4. Biological systems usually produce a single enantiomer, whereas chemical synthesis produces a

Racemic mixture

5. In the tripeptide Lys-Pro-Ile, the C-terminal residue is

Isoleucine

6. In the tripeptide Trp-Val-Phe, the N-terminal residue is

tryptophan

7. In the peptide Trp-Ser-Val, valine is at the

c-terminus

8. At a pH below its pKa, the β-carboxylate group of Asp is

uncharged or protonated

9. In the tripeptide Lys-Pro-Ile, there are ______ charged groups at pH 7.

three

10. At a pH above its pKa, the phenol group of tyrosine is

deprotonated

11. The net charge of the zwitterion form of Gly is

zero

12. Which illness can be caused by reduced levels of serotonin in the brain?

depression

13. What is the function of serotonin?

neurotransmitter

14. From which amino acid is serotonin derived?

tryptophan

15. From which amino acid is GABA derived (give the name of the amino acid closest in structure to GABA).

glutamate