Enzymes

• Enzymes help to break or build up molecules.

  They are biological catalysts that catalyse the rate of a chemical reaction in the body, but doesn‘t take part in the reaction.

  ENZYMES:

  • Lipase
  • Protease
  • Amylase
  • Catalase

  ……..
• The lock key model - how enzymes break down substrates.

  For an enzyme to work both the substrate and active site have to fit together - enzyme-substrate complex

  Enzymes are specific and not used up.
• DENATURE

  Extreme temperatures or pHc changes the enzymes active site, so substrate can’t fit into active site -> no reaction -> denatured

  Optimum temperature or pH is where the enzyme is working at its fastest rate.
• Enzymes belong to a group of molecules called proteins:

  • Each enzymes has a specific shape to fit the substrate.
  • Different enzymes contain different amino acids - different active sites.
  • Enzymes are specific.