Biology Unit 2a (B2): Cells

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  • Biology: Cells
    • Animal Cells
      • Nucleus: Contains DNA that controls the activities of the cell.
      • Cytoplasm: gel-like substance where most of the chemical reactions happen. It contains enzymes that control these chemical reactions.
      • Cell Membrane: Holds the cell together and controls what goes in and out.
      • Mitochondria: Where most of the reactions for respiration take place. Respiration releases energy that the cell needs to work.
      • Ribosomes: These are where proteins are made in the cell.
    • Plant Cells
      • Rigid Cell Wall: Made of cellulose. It supports and strengthens the cell.
      • Permanent Vacuole: These absorb light energy to make food for the plant. Contains cell sap, a weak solution of sugar and salts.
      • The plant cell also contains the same features as the animal cells e.g. Cytoplasm.
      • Chloroplasts: These are where photosynthesis occurs, which makes food for the plant. They contain a green substance called chlorophyll.
    • Yeast Cells
      • Yeast Cells are single-celled Organisms.
      • They all contain these parts such as Nucleus, Cell Membrane and Cytoplasm. Which is surrounded by a cell wall.
    • Bacterial Cells
      • They DON'T have a nucleus.
      • The DNA (genetic material) floats in the cytoplasm because they DON'T have a nucleus.
      • These cells all contain the same parts such as Cell Membrane and Cytoplasm that is also surrounded by a Cell Wall.
      • It is also a single-celled organism.


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