Answer:
Amino acid is the molecule which contains both the carboxyl and amino functional group in the same molecule.
Explanation:
Amino acid is R(NH2)COOH.
It has both an amine group(NH2-) and a carboxylic acid group(COOH -) in the same molecule.Thats why its called an amino acid.
Starch is a polysaccharide.That means its composed of many sugar molecules.
Nucleic acid is composed of Phoshpate group - sugar - nitrogenous base
Glucose is a carbohydrate.And it contains only C,H and O in it.
Hence we can say that starch,nucleic acid and glucose doesn't contain amino group or carboxylic group or both together in same molecule.
