Which of the following organic molecules contain both an amine and carboxyl group?
A.
Lipids.
B.
Chitin.
C.
Cellulose.
D.
Proteins
The organic molecules that contain both an amine and a carboxyl group are:
D. Proteins
Explanation:
Proteins are composed of amino acids, which each have both an amine group (-NH₂) and a carboxyl group (-COOH). These functional groups are essential for forming peptide bonds between amino acids and for the protein’s overall structure and function.
Lipids do not contain both amine and carboxyl groups. They are primarily composed of fatty acids and glycerol, which do not include amine groups.
Chitin is a structural polysaccharide found in exoskeletons of arthropods and insects. It contains amino groups but not a carboxyl group in the same way as amino acids.
Cellulose is a polysaccharide that consists of glucose units linked by β-glycosidic bonds. It does not contain amine groups; it contains only hydroxyl groups.
Therefore, proteins are the correct answer as they uniquely contain both amine and carboxyl groups