Cell structure

• What is a eukaryotic cell?

  Have a true nucleus. E.g. plant, animal and fungi
• What is a prokaryotic cell?

  A cell without a nucleus. E.g. bacteria
• Why do you stain cells?

  To visualize their structures. Makes them easier to observe
• cytoplasm

  Jelly-like. Where chemical reactions occur.
• Nucleus

  Contains DNA
• Cell membrane

  Controls the movement of substances into and out of the cell. Contains receptor molecules.
• Mitochondria

  Where respiration happens
• Chloroplasts

  Contain chlorophyll which absorbs light energy for photosynthesis to occur.
• Cell wall

  Strengths and supports the plant
• Vacuole

  Filled with cell cap
• Benefits of an electronic microscope

  Much higher resolution
• Disadvantage of an electronic microscope

  Expensive to buy and operate, specimen’s have to be dead
• Using a light microscope

  1. Move stage to lowest position

  2. Select objective lens with lowest

  magnification

  3. Place the slide onto the stage

  4. Turn the coarse focus knob slowly until

  you see the specimen

  5. Turn the fine focus knob slowly until

  your object comes into clear focus

  6. Repeat using the higher magnifiCation objective lenses
• Magnification if the microscope

  magnification of eyepiece × magnification of objective