Question

which component makes each amino acid unique?
amino group
carboxyl group
r group
phosphate group

Explanation:

Amino acids have a general structure with an amino group (\(-NH_2\)), a carboxyl group (\(-COOH\)), and an R group (side - chain). The amino group and carboxyl group are common to all amino acids. The phosphate group is not part of the basic amino - acid structure. The R group varies among different amino acids, giving each its unique properties.

Answer:

C. R group