Which of the following is not true regarding the formation of a dipeptide?

A. a molecule of water is produced

B. two amino acids are joined together

C. a double bond forms between carbon and nitrogen

D. a protein is formed

The correct answer is option C. "a double bond forms between carbon and nitrogen".

Explanation:

A dipeptide are formed by the binding of two amino acids. The chemical bond that binds the two amino acids is called peptide bond, and when enough amino acids are joined together a protein is formed. It is not true that a double bond forms between carbon and nitrogen during the formation of a dipeptide, carbon and nitrogen are bond by a single covalent bond.

D. a protein is formed.

Explanation:

The formation of a dipeptide is the join of two amino acids by a peptide bond, when this occurs a molecule of water is produced, two amino acids are joined together and a double bond forms between the carbon and the nitrogen from the two amino acids. A protein is composed by one or more large chains of amino acids, in other words, a great number of peptide bonds are needed to form a protein not just one which will give a dipeptide or two which will give a tripeptide.