medium · MCAT bio-biochem

A researcher is analyzing the primary structure of a newly isolated peptide hormone. The peptide consists of a sequence of amino acids linked by bonds formed through a dehydration reaction.

What is the nature of this peptide bond?

  1. It is an ester bond that is easily hydrolyzed by simple changes in pH.
  2. It is an amide bond that exhibits partial double-bond character.
  3. It is a disulfide bridge formed between cysteine residues.
  4. It is a non-covalent hydrogen bond that stabilizes the alpha-helix.

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