Biological molecules - topic 1.4

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  • Topic 1.4
    • How enzymes work? - 1.4.2
      • The reaction has to get over the 'engery hill' - activation energy
        • Enzymes form a complex with the substrate
          • Catabolic reaction:substrate + enzyme = enzyme/substrate complex =enzyme + products
      • The 'lock - and key hypothesis'
        • Induced fit hypothesis
      • Initial rate of reaction - is affected by temperature , PH and concentration
        • Enzymes change only the rate of reaction
      • Evidence for the relationship betweeb structure and functions of enzymes
        • Enzymes speed up reactions to such an extent
          • Molecular activity - the number of substrate molecules transformed per minute by a single enzyme molecule
            • Temperature coefficient
        • Enzymes are very specific to the reaction that they catalyse
        • The number of substrate molecules present affects of an enzyme-catalysed reaction
    • Enzyme inhibition
      • Enzyme inhibitors
        • Reversible inhibitiob
          • Two forms of reversible inhibition
            • Competitive inhibition
              • similiar shape to substrate molecule
            • Non-competitive inhibition
              • may form a complex with either the enzyme itself or the enzyme/substrate complex
        • Irreversible inhibition
        • End - prodiuct inhibition: is a control system in many metabolic pathways in which an enzyme at the beginning of the pathway is inhibited by one of the end products of the reaction


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