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 ? carbon
D) different structural and optical isomers
E) different asymmetric carbons


Answer: C

Biology & Microbiology

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