Science S2 - Cells and Microscopy

Organism Classifications

  • An organism made of 11 cell is called unicellular.
  • A microorganism or microbe is a living thing that can only be seen with a microscope.
  • Multicellular organisms are organisms made of multiple cells.

Cell Measurement and Units

  • 1 millimeter=1000 micrometers1\,\text{millimeter} = 1000\,\text{micrometers}
  • A cell measured at 0.035 mm0.035\,\text{mm} is equivalent to 35 micrometers35\,\text{micrometers}.

Stains for Microscopy

  • Methylene blue is used to view animal cells under a microscope.
  • Iodine is used to view plant cells under a microscope.
  • Iodine is typically yellow or brown in color and turns blue-black when it reacts to starch.