Question

What is the R group of the amino acid, lysine?
1) H+
2) -OH
3) CH₃
4) NH₂

Answer 1

The R group of the amino acid lysine is -(CH2)4NH2, which is a long aliphatic chain ending in an amino group (NH2).

Step-by-step explanation:

The R group of the amino acid lysine is characterized by a long aliphatic chain ending in an amino group. This amino group is what gives lysine its basic characteristics, as it can accept a proton. The R group for lysine can be depicted as -(CH2)4NH2. Therefore, from the provided options, the correct option is 4) NH2 as it represents the amino group which is a part of the side chain of lysine.