Each amino acid differs from others in the
A) number of central carbon atoms.
B) size of the amino group.
C) number of carboxyl groups.
D) chemical structure of the R group.
E) number of peptide bonds in the molecule.

Question

Quizplus · Accepted Answer

Amino acids differ from one another in the chemical structure of their R group, which can be any of 20 different side chains. The other choices are not correct, as all amino acids have a central carbon atom, an amino group, and a carboxyl group, and the number of peptide bonds is the same for all amino acids within a given polypeptide chain.

Each Amino Acid Differs from Others in the