Which components are identical in all amino acids?

Question

Responses

the R group
the R group

the R group, a single hydrogen atom, and an amino group
the R group, a single hydrogen atom, and an amino group

a single hydrogen atom, an amino group, and a carboxyl group
a single hydrogen atom, an amino group, and a carboxyl group

the R group, an amino group, and a carboxyl group

Answer 1

The correct response is:

a single hydrogen atom, an amino group, and a carboxyl group

All amino acids share a common structure that includes a central carbon atom (the alpha carbon) to which a single hydrogen atom, an amino group (-NH₂), and a carboxyl group (-COOH) are attached. The only variable among different amino acids is the R group (or side chain), which differs from one amino acid to another.