• All living organisms can be grouped or 'classified' using a classification system that consists of?five kingdoms. These five kingdoms are:
  • Animals
  • Plants
  • Fungi
  • Protoctists
  • Prokaryotes

   

• The first four kingdoms in this list (the animals, plants, fungi and protoctists) can actually be?grouped together, as they are all?eukaryotic organisms?(also known as?eukaryotes)

Animals, plants, fungi and protoctists are all eukaryotes

• Eukaryotic organisms can be?multicellular or single-celled?and are made up of cells that contain a?nucleus?with a?distinct membrane

An animal cell (left) and plant cell (right) as seen under a light microscope. They are both eukaryotic cells as they both have a distinct membrane-bound nucleus.

• Prokaryotic organisms?(also known as?prokaryotes) are in a?separate kingdom?and are?different?from eukaryotes as they are?always single-celled?and?do not contain a nucleus?(instead, the?nuclear material?of prokaryotic cells is found in the?cytoplasm)
  • Bacteria?are prokaryotic organisms

   

• Prokaryotic cells are substantially?smaller?than eukaryotic cells

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