Biology

• All living things are made of cells, they are the basic unit of all life
• Eukaryotic cells


  Have a cell membrane, cytoplasm and genetic material (DNA) enclosed in a nucleus
• Prokaryotic cells


  Smaller than eukaryotic cells, the genetic material is not enclosed in a nucleus, the DNA is a single loop and there may be one or more rings of DNA called plasmids
• Animal and plant cells are eukaryotic cells
• Bacterial cells are prokaryotic cells
• Prefixes used in science to make very small numbers more manageable

  • centi (cm)
  • milli (mm)
  • micro (μm)
  • nano (nm)
• centi (cm)


  1 cm = 0.01 m
• milli (mm)


  1 mm = 0.001 m
• micro (μm)


  1 μm = 0.000 001 m
• nano (nm)


  1 nm = 0.000 000 001 m