Question

select the true statements.
a peptide forms when two proteins join together.
two carboxyl groups combine to make a peptide bond.
when a peptide bond is formed, water is released.
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Explanation:

• A peptide is formed when two amino acids join together, not two proteins. Proteins are made up of multiple peptides or amino acids. So the first statement is false.
• A peptide bond is formed when the carboxyl group (-COOH) of one amino acid reacts with the amino group (-NH₂) of another amino acid. It is not formed by two carboxyl groups. So the second statement is false.
• When a peptide bond is formed between the carboxyl group of one amino acid and the amino group of another amino acid, a water molecule (H₂O) is released. This is a condensation reaction. So the third statement is true.

Answer:

When a peptide bond is formed, water is released.