Biology

• Cell membrane


  Forms a boundary, selectively permeable, controlling what enters and leaves
• Animal, Plant, Bacterial cells


  • Cell membrane present
  • Cell membrane not present
• Cell


  • Site of chemical reactions
  • Control centre of the cell
  • Contains genetic information in the form of chromosomes, surrounded by a nuclear membrane
• Nucleus


  • Boundary of nucleus, Controls what enters and leaves the nucleus
• Mitochondria


  • Sites of cell respiration
• Cell wall


  • Made of cellulose, provides support, contains cell sap and provides support
• Vacuole


  • Contains cell sap and provides support
• Chloroplasts


  • Contain chlorophyll; the site where photosynthesis takes place
• Plasmids


  • Small circular rings of DNA
• Structures present in all 3 types of cells

  • Cell membrane
  • Cytoplasm
• Making a slide of a Plant Cell

  1. Peel a small section of onion tissue and place on the centre of a microscope slide

  2. Add water using a drop pipette to the onion tissue

  3. Gently lower a coverslip onto the onion tissue

  4. Set the slide onto the stage of the microscope and examine using low power first and then high power
• Making a slide of Animal Cells

  1. Gently scrape the inside of your cheek onto the centre of a microscope slide

  2. Carefully lower a coverslip on top

  3. Observe using a light microscope, first at lower power and then higher power
• Cell


  Basic building block of living organisms
• Tissue


  Groups of cells with similar structures and functions
• Organ


  Groups of different tissues working together to form a structure with a particular function
• Organ System


  Different organ systems make up the organism
• Organism


  Order of increasing complexity