Which compound contains both carbxyl and amino functional groups in the same molecule
a. starch
b. nucleic acid
c. amino acid
d. glucose

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.

the answer is:  

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