All of the 20 Common Amino Acids Contain an R-Group

Question

All of the 20 common amino acids contain an R-group that is attached to the:
A) carboxyl group.
B) amino group.
C) $\alpha$ carbon.
D) $\beta$ carbon.
E) It depends on the amino acid

Accepted Answer

The R-group in amino acids is attached to the alpha (α) carbon, which is the central carbon atom to which the amino group, carboxyl group, hydrogen atom, and R-group (side chain) are attached.