Redseal Hairstyling License Practice Test

What is formed between amino acids?

1. Peptide bond

2. Disulfide bond

3. Hydrogen bond

4. Salt bond

The correct answer is: Peptide bond

The formation of a peptide bond between amino acids is a fundamental concept in biochemistry and molecular biology. When two amino acids come together through a dehydration synthesis reaction, the carboxylic acid group of one amino acid reacts with the amino group of another. This reaction results in the release of a water molecule, and a covalent bond is formed between the carbon of the carboxylic acid and the nitrogen of the amino group, resulting in a peptide bond. Peptide bonds are key to creating polypeptides and proteins, as they link amino acids together in a specific sequence, which ultimately determines the structure and function of the resulting protein. Understanding how peptide bonds are formed helps explain the building blocks of proteins and their importance in biological processes. While disulfide bonds, hydrogen bonds, and salt bonds also play significant roles in protein structure and stability, they are not the primary connections between individual amino acids in a chain. Disulfide bonds form between the sulfur atoms of cysteine residues, hydrogen bonds can occur between different parts of a protein or between side chains, and salt bonds are ionic attractions between charged side chains. These interactions contribute to the overall 3D structure of proteins but do not form the initial linkage between the amino acids themselves.