BiomoleculeshardNUMERICAL

A researcher thoroughly hydrolyses a single, purified molecule of a strictly linear decapeptide intoBiomolecules Chemistry Question

Question

A researcher thoroughly hydrolyses a single, purified molecule of a strictly linear decapeptide into its free amino acid monomers. Exactly how many individual molecules of water are consumed chemically in this complete process?

Answer: 9

💡 Solution & Explanation

A strictly linear decapeptide is composed of $10$ amino acid residues covalently linked sequentially by exactly $9$ peptide (amide) bonds. The stoichiometric hydrolysis of each specific peptide bond breaks it by consuming precisely $1$ molecule of $H_2O$. Thus, $9$ water molecules are needed.

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