Enzymes

• Enzymes are biological catalysts that speed up a reaction by lowering the activation energy, without being used up or changed
• Enzymes are large proteins made of amino acids
• Enzymes have specific active sites that only fit specific substrates.
• What is the lock and key theory?

  That certain substrates fit certain active sites, like locks and keys
• Why do enzymes need the right temperature and pH?

  As if the temperature is too high, the enzyme will denature and if the temperature is too low, the enzyme won't work at it's optimum.
• Enzymes break down large molecules (like starch, proteins and fats) into smaller (like sugars, amino acids, glycerol and fatty acids)