Which level of protein structure is defined by the specific linear sequence of amino acids linked by peptide bonds?
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Correct answer: Water (H2O)
Peptide bond formation is a condensation (dehydration synthesis) reaction. The carboxyl group of one amino acid reacts with the amino group of the next, releasing one molecule of water (H2O) and forming a covalent C–N peptide bond that links the two residues.
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