There are 20 different amino acids. What makes one amino acid ...

[camila]

There are 20 different amino acids. What makes one amino acid different from another?
A) different side chains (R groups) attached to a carboxyl carbon
B) different side chains (R groups) attached to the amino groups
C) different side chains (R groups) attached to an α carbon
D) different structural and optical isomers
E) different asymmetric carbons

[ricki]

Try this as the answer C. Hope it helps.

[camila]

Thanks