Enzymes slides for moodle 2013

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Enzymes slides for moodle 2013

  1. 1. Catalyst A substance that speeds up the rate of a chemical reaction Enzymes are BIOLOGICAL catalysts Reaction could still happen, but not as fast! What enzyme works on
  2. 2. Catalyst Catalysts decrease the amount of energy needed to start the chemical reaction (activation energy) Why need? •Reaction too slow •Activation energy too high Compare these
  3. 3. Enzymes Proteins that act as biological catalysts Enzymes are NOT used up in a reaction Enzymes are very specific – Substrates and enzyme fit like “lock and key” Substrates are the REACTANTS PRODUCT
  4. 4. Enzymes Enzymes are affected by changes in pH, temperature, regulatory molecules, substrate concentration

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