1. Lysine is an amino acid with a net positive charge. Which functional group is responsible for this net charge?
a) Carboxylic acid on alpha Carbon
b) Amine on Alpha Carbon
c) Amine on side chain
d) "a" and "b" are good.
2. From which amino acid can a phosphate be removed?
a) Serine.
b) Phospho-cysteine
c) Tyrosine
d) Phospho-threonine