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  • Created by: hsmith08
  • Created on: 21-04-15 18:08
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  • ATP
    • Why do we need energy?
      • Metabolism- all reactions taking place in living organisms
      • movement- both within an organism and the organism itself
      • active transport- ions and molecules go against their concentration gradient
      • maintenance, repair and division
      • production of substances
      • maintenance of body temperature
    • What is energy?
      • 'ability to do work'
        • 1. Light energy from the sun is converted by plants into chemical energy
        • 2. Chemical energy from photosynthesis is converted to ATP during respiration
        • 3. ATP is used by cells to perform useful work
      • takes a variety of forms, eg light and heat
      • cannot be created or destroyed
      • measured in joules (J)
    • ATP + (H2O) ->ADP+Pi+E
      • photophosphorylation-
        • takes place in chlorophyll containing plant cells during photosynthesis
      • oxidative phosphorylation-
        • occurs in mitochondria during electron transport chain
      • substrate-level phosphorylation
        • occurs when phosphate groups are transferred from donor molecules to ADP (in glycolysis)
    • Roles
      • immediate source of energy as it is easily broken down
        • break down is single step reaction
      • ATP is rapidly re-formed
      • released in small, manageable amounts


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