Year 10 Edexcel Biology Exam

Topic 1: Key concepts
1. Cells
  1. Can Be Prokaryote Or Eukaryote
    1. Prokaryotes are simple
    2. Eukaryotes are Complex
      1. Plant and Animal Cells
        Both Contain
        Nucleus: 'brain of the cell'
        Cytoplasm: where chem reactions occur
        Cell membrane: controls what goes in and out
        Mitochondria: Respiratiion
        Ribosomes: translation
        But plant Cells Contain
        Cell Wall: supports cell
        Vacuole: cell sap
        Chloroplasts:photosythesis
  2. Specialised Cells
    1. Egg cells
      1. haploid
    2. sperm
      1. tail for swimming
      2. haploid
      3. mitochondria
    3. Ciliated Epithelial cells
      1. cilia on top
2. Microscopy
  1. See practical in Revision Guide (CGP) Page 14
  2. Total magnification= eyepiece lens magnification x objective lens magnification
  3. Magnification=Image size/real size
3. Enzymes
  1. Are Catalysts
    1. They Catalyise by either joining up or splitting apart the substarte
    2. Enzymes have a active site specific to substrate
  2. Tempreture, pH and substrate Conc affect rate of reaction
  3. Check p.17
  4. Rate=1000/time
  5. Rate of Reaction
  6. Enzymes Break Down Big molecules
    1. Proteins, Lipids and Carbohydrates are examples
      1. Protease Coverts Protein to amino Acids
      2. Lipases covert Lipids to fatty acids
    2. Amylase Converts Carbohydrates to simple sugars
  7. You can test for sugars using Benedicts Reagent
  8. Starch with iodiene
  9. Emulsion Test For lipids
  10. Energy in food (j)= mass of water x Temp x 4.2
Diffusion, Osmosis And Active Transport
1. Diffusion
  1. movement of particles from High conc to low conc
2. Osmosis
  1. movement of water through a partial permeable membrane from high to low conc
3. Active Transport
  1. movement of particles from area of high conc to low conc against conc graidient using energy

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Year 10 Edexcel Biology Exam

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