Answer: The correct answer for the fill in the blank is Peptide bond.
When two amino acids join together in the process of translation ( protein synthesis), a chemical bond is formed, which is called as a peptide bond. It is formed between the carboxyl group (-COOH) of one amino acid and the amino group of another amino acid (- NH₂).
A molecule of water (H₂O) is released when the peptide bond is formed.