What bond is forming between the amino acids?

Question

BlackTom AI · Accepted Answer

When considering what bonds form between amino acids in a peptide chain, several options can be evaluated for biological accuracy.
Option 1: 'Peptide bond' — This is the correct conceptual answer. A peptide bond is a covalent bond formed between the carboxyl carbon of one amino acid and the amino nitrogen of the next amino acid, typically through a dehydration synthesis reaction, linking amino acids into a polypeptide.
Option 2: 'Esther Bond' — This appears to be a misspelling or confusion with 'ester bond.' Ester bonds form between alcohols and carboxylic acids in fats (triglycerides) and other esterified compounds, not the peptide link between amino acids; therefore this is not the bond that forms between amino acids in proteins.
Option 3: 'Hydrogen bond' — Hydrogen bonds do stabilize secondary structures like alpha helices and beta sheets in proteins, helping to hold the folded conformation, but they are non-covalent interactions, not the primary bond that connects amino acids in the backbone. They pair partially and stabilize structure rather than link amino acids in a chain.
Option 4: 'Glucosidic bond' — Glucosidic bonds join sugar molecules (glycosidic linkage) in carbohydrates, not amino acids. This term is specific to carbohydrate chemistry and is not involved in peptide formation.
Option 5: 'Phosphodiester bond' — Phosphodiester bonds link nucleotides in nucleic acids (DNA and RNA), creating the sugar-phosphate backbone. They are unrelated to amino acid joining in proteins.
In summary, the bond specifically responsible for joining amino acids into a protein polymer is the peptide bond, a covalent linkage formed between the amino group of one amino acid and the carboxyl group of the adjacent amino acid, with release of water during synthesis.

AGRI10050_2025_SM1 W2 Prep: Macromolecule Quiz Part 2 (Nucleic acids and Proteins) (10-15 min)

What bond is forming between the amino acids?

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