Introduction to Enzymes Thousands of biochemical reactions proceed at any given instant within living cells.These reactions are catalyzed by en☑ymes, Enzymes are mostly proteins.But two important enzymes are most certainly to be RNA(ribozymes).One is the ribosome (peptidyl transfer)and the other is the splicesome (splicing of intron); Enzymes are the agents of metabolic function.Enzymes play key functions in controlling rate of reaction,coupling reactions,and sensing the momentary metabolic needs of the cell.Introduction to Enzymes • Thousands of biochemical reactions proceed at any given instant within living cells. These reactions are catalyzed by enzymes; • Enzymes are mostly proteins. But two important enzymes are most certainly to be RNA (ribozymes). One is the ribosome (peptidyl transfer) and the other is the splicesome (splicing of intron); • Enzymes are the agents of metabolic function. Enzymes play key functions in controlling rate of reaction, coupling reactions, and sensing the momentary metabolic needs of the cell