IGCSE Biology

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  • Created by: Hamzahhp
  • Created on: 18-04-18 19:51
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  • Structures and Functions in Living Organisms
    • Characterisitics
      • Movement
      • Respiration
      • Sensitivity
      • Growth
      • Reprduction
      • Excretion
      • Nutrition
      • Control
    • Levels of Organisation
      • Cells
        • animal cells
          • nucleus, cytoplasm, cell membrane,mitochondria
        • plant cells
          • vacuole, cell wall, chloroplasts
      • Tissues
      • Organs
      • Organ Systems
    • Plants, Animals and Fungi
    • Bacteria, Protoctists and Viruses
    • Enzymes
      • are biological catalysts
      • Optimum temp is 37 degrees
        • higher temp. denatures them
      • Very specific
        • Substrate
        • active site
    • Diffusion
      • net movement of particles from an area oh higher concentration to a lower concentration
      • diffuse through membranes
    • Osmosis
      • net movement of water molecules from high conc. to lower. conc. through 'partially permeable membrane'
      • happens in cells
    • Active Transport
      • basically diffusion but goes from low to high
    • factors affecting movement
      • large SA:Vol
      • high Temp.
      • big difference in Concentration Gradient

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