Cells

• Light microscopes are cheap and easy to use, but they have a limited resolution and magnification. Only seeing the outlines of the cells.
• Electron microscopes will stronger details including Organelles (sub-cellular structure) due to their higher magnification.
• Magnification= image size / object (cell) size
• Cells are only a few micrometers long
• Convert um to mm by dividing by 1000
• Eukaryotic cells have a nucleus which their DNA can be found.
• Eukaryotic cells is Animal & plant cells
• Prokaryotic cells don't have a nuclear, but their DNA is found in Plasmid.
• Animal & plant cells both contain, cell membrane, nucleus, mitochondria, cytoplasm, & ribosome.
• • Cell membrane is semi permeable which controls what enters & leaves the cell
  • Nucleus contains genetic information (DNA)
  • Mitochondria is the site of respiration
  • Ribosome is the site of protein synthesis
• A plant cell contains the following whereas an animal cell doesn't:

  • Chloroplast (Photosynthesis)
  • Cell wall (Cellulose)
  • Permanent vacuole (stores sap)
• Bacteria reproduce by binary fission, which is the division of a single cell into two identical cells.