Question

question 29
which two functional groups are always found in amino acids?
hydroxyl and carboxyl
carbonyl and amino
ketone and amino
carboxyl and amino

Explanation:

Amino acids have a general structure with a carboxyl group (-COOH) and an amino group (-NH₂). These are the defining functional - groups of amino acids. Hydroxyl (-OH), carbonyl (C=O), and ketone (RCOR') are not the characteristic functional groups of amino acids.

Answer:

D. carboxyl and amino