Why do cells contain many different enzymes? (A) Enzymes are temperature specific - HSC - SSCE Biology - Question 2 - 2007 - Paper 1

Cells contain many different enzymes because enzymes perform specific actions and catalyze particular biochemical reactions. Each enzyme has a unique active site that binds to a specific substrate, which enables it to facilitate a specific reaction. This specificity allows cells to regulate their metabolic pathways effectively and respond to various physiological demands.

Additionally, multiple enzymes may be required for different stages of a metabolic pathway, or to process different substrates, making the presence of many different enzymes essential for cellular function.