Lysine and histidine are positively charged at cell pH.


1.True
2.False
Glycine is a _____
1.Nonpolar amino acid
2.Positively charged at cell pH
3.Negatively charged at cell pH
4.Polar amino acid
Cysteine is capable of forming _____ which are covalent bonds
1.Hydrogen bonds
2.Helium bonds
3.Disulfide bonds
4.Cysteine bonds
Amino acids are joined together by peptide bonds

1.True
2.False