(i) Peptide linkage: Proteins are complex nitrogenous polymeric substances present in all forms of living matter. These are obtained by the condensation polymerisation of α-amino acids through the formation of peptide bonds.
(ii) Biocatalyst: Enzymes are complex nitrogenous substances (proteins) having molecular weight of 10,000 or even more. Enzymes increase the rate of biochemical reactions by providing alternative path of lower activation energy.
Therefore, enzymes are termed as biochemical catalyst and phenomenon is known as biochemical catalysis.
