Question

all amino acids have a central carbon with four components attached to it. which component is different for each amino acid? hydrogen atom carboxyl group r group group with nitrogen and 2 hydrogen atoms

Explanation:

Amino - acids have a general structure with a central carbon bonded to a hydrogen atom, a carboxyl group ($-COOH$), an amino group ($-NH_2$), and an R - group. The hydrogen atom, carboxyl group, and amino group are common features, while the R - group varies among different amino - acids, giving each its unique properties.

Answer:

C. R group