• Enzymes are?biological catalysts
  • ‘Biological’ because they function in?living systems
  • ‘Catalysts’ because they?speed up the rate of chemical reactions?without being used up or changed
• Enzymes are also?globular proteins
• Critical to the enzyme's function is the?active site?where the?substrate binds
• Metabolic pathways?are controlled by enzymes in a biochemical cascade of reactions
  • Virtually every metabolic reaction within living organisms is catalysed by an enzyme – enzymes are therefore essential for life to exist

• Enzymes can be?intracellular?or?extracellular?referring to whether they are active inside or outside the cell respectively
• Intracellular?enzymes are?produced?and?function?inside the cell
• Extracellular?enzymes are?secreted?by cells and catalyse reactions?outside?cells (eg. digestive enzymes in the gut)

Enzymes Table