amino acid structure: the only part of the amino acid structure that varies between the amino acids and makes each type unique is

The side groups are what make each amino acid different from the others. Of the 20 side groups used to make proteins, there are two main groups: polar and non-polar. These names refer to the way the side groups, sometimes called "R" groups, interact with the environment.

Explanation:

in addition to spreading humanist ideas, erasmus has contributed to criticism of corruption in the church.