The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of different

side chains or groups

Explanation:

The side groups are what make each amino acid different from the others. Of the 20 side groups or polypeptides, 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 which is why they are different

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