Cells and Cell Structure

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  • B2.1 Cells and Simple Cell Transport
    • Human and Animal Cells
      • Nucleus controls activities of the cell
      • Cytoplasm allows chemical reactions to take place
      • Cell Membrane controls the passage of substances in and out of the cell
      • Mitochondria is where energy is released in Respiration
      • Ribosome is where protein synthesis occurs
    • Plant Cells
      • Cell wall made of cellulose which strengthens the cell
      • Chloroplasts absorb light energy to make food
      • Permanent Vacuole filled with cell sap keeps the cells rigid to support the plant
    • Other Cells
      • Bacterial cell consists of cytoplasm and a membrane surrounded by a cell wall
      • Yeast is a single-celled organism which have a nucleus, cytoplasm and a membrane surrounded by a cell wall.
    • Dissolved Substances
      • Dissolved substances move into and out of cells by diffusion
      • Diffusion  is the spreading of particles from a higher concentration to a lower concentration
      • The greater the difference in concentration the faster the rate of diffusion
      • Oxygen required for Respiration passes through cell membranes by diffusion



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