Problem:
Question: lysine,K, is said to be a basic amina acid because it:
a)can contribute a proton from its carboxyl group at neutral pH
b) can accept a proton onto its carboxyl group at low pH
c) can accept a proton onto its amino group attached to the alpha carbon
d) has a second amino group on its R group that accepts a proton
e) none of the above
Give reasoning with your answer.