Question

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in a polypeptide, there is a free group at the n - terminus and a free group at the c - terminus.
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Explanation:

Polypeptides have a free amino ($-NH_2$) group at the N - terminus and a free carboxyl ($-COOH$) group at the C - terminus due to their chemical structure and the way amino acids are linked.

Answer:

Amino; Carboxyl