Question

What molecules form proteins when linked with covalent bonds?

Answer 1

Amino acids

Explanation:

Amino acids are organic molecules that contain amino group and carboxyl group.

http://www.biology.arizona.edu/biochemistry/problem_sets/aa/BasicStruct.html

Amino acids link with each other by mean of peptide bonds(covalent chemical bond) and form proteins as a result.

https://www.quora.com/In-chemistry-how-do-amino-acids-form-proteins