Question

What molecules link together to form proteins?

Answer 1

Amino acids are the building blocks of proteins.

Explanation:

Amino acids are a group of organic molecules that consist of an amino group, a carboxylic acid group and an organic alkyl group.
The amino acids differ from each other in the chemical structure of their alkyl groups.

As a result of condensation reaction, two amino acids are linked together by the formation of a peptide bond.
Amino acids joined by a series of peptide bonds constitute a peptide chain.

Thus , a protein molecule is a polypeptide chain composed of many amino acid residues. The length of different proteins range from a few dozen to thousands of amino acids.