Which of the following defines a peptide bond?

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BlackTom AI · Accepted Answer

To understand what a peptide bond is, let's evaluate each option in turn and connect them to fundamental biochemistry concepts.
Option 1: 'The bond between two amino acids in a peptide chain' This is correct. A peptide bond is the covalent linkage formed by the condensation reaction between the carboxyl group of one amino acid and the amino group of the next, resulting in a -CO-NH- bond that links amino acids into a chain.
Option 2: 'The bond between amino and carboxyl groups within an amino acid' This describes the bond that connects the atoms within a single amino acid (often called the intramolecular bonds that define amino acid structure), but a peptide bond specifically refers to the linkage between two amino acids in a chain, not the internal bonds of one amino acid.
Option 3: 'The bond between two proteins in a protein complex' This would imply interactions between separate protein molecules, such as non-covalent associations or disulfide cross-links in multimeric assemblies, but it is not what is meant by a peptide bond. Peptide bonds occur within a polypeptide chain, not between separate proteins.
Option 4: 'The bonds that create the tertiary structure within a protein' The tertiary structure arises from various interactions (hydrogen bonds, ionic interactions, hydrophobic effects, disulfide bonds) among side chains and the backbone, not a single bond type that links amino acids together. While peptide bonds are foundational to the backbone, they themselves do not define tertiary structure; rather, they form the primary sequence that folds into tertiary structure through other interactions.
In summary, option 1 accurately identifies the peptide bond as the linkage between adjacent amino acids in a peptide chain, while options 2, 3, and 4 describe different concepts that do not define the peptide bond itself.

Which of the following defines a peptide bond?

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