Question

question 14 of 15 which of the following occurs when a peptide bond forms between two amino acids? a. a water molecule is released as a covalent bond forms between a carboxyl group of one amino acid and an amino group of another amino acid. b. a covalent bond forms between the carboxyl groups of two amino acids with the addition of a water molecule. c. a water molecule is consumed as a covalent bond forms between a carboxyl group of one amino acid and an amino group of another amino acid. d. a covalent bond forms between the r groups of two amino acids with the release of a water molecule.

Explanation:

When two amino acids form a peptide bond, it is a condensation reaction. The carboxyl group (\(-COOH\)) of one amino acid reacts with the amino group (\(-NH_2\)) of another amino acid. A water (\(H_2O\)) molecule is released (\( -OH\) from the carboxyl group and \( -H\) from the amino group combine to form \(H_2O\)), and a covalent bond (\(-CO - NH-\)) is formed between the two amino acids.

• Option B is incorrect because the bond does not form between two carboxyl groups and water is not added.
• Option C is wrong as water is released, not consumed.
• Option D is incorrect because the bond forms between the carboxyl and amino groups, not the R - groups.

Answer:

A. A water molecule is released as a covalent bond forms between a carboxyl group of one amino acid and an amino group of another amino acid.