What is the difference between amino acids and nucleotides? is one a subset of the other?
what is a group of a molecule?
what are carboxyl and amino groups of a molecule?

Nucleic Acids (RNA and DNA) are made up of a series of nucleotides. The center of an amino acid is the carbon bonded to four different groups. The fourth group, R, is different for each amino acid. A nucleotide is composed of a five-carbon sugar, a nitrogenous base and a phosphate group.
A molecule is an electrically neutralgroup of two or more atoms held together by chemical bonds.Molecules are distinguished from ions by their lack of electrical charge.
Amino acids have a two-carbon bond. One of the carbons is part of a group called thecarboxyl group(COO-). A carboxyl group is made up of one carbon (C) and two oxygen (O) atoms.

Amino acids make up proteins and nucleotides make up nucleic acid that transfer genetic information from one generation to other
amino acids first appear then nucleotides