Classifying Organisms: The FiveKingdom Classification Scheme

1

• Protists
• Bacteria
• 3. Fungi
• 4. Animals
• Plants
• 1. Protists are single-celled microbes that have
  a nucleus. Some cause illness, such as a
  sleeping sickness and digestive system problems
  in humans, while others are harmless.

• Classifying Organisms The Five-Kingdom
  Classification Scheme
• 1. Protists

2

• 2. Bacteria

• 2. Bacteria are single-celled microbes that do
  not have a nucleus. Bacteria are extremely tiny
  and they can be found almost everywhere!
• The skin on your leg has about 8,000 bacteria per
  square inch!
• Some bacteria cause diseases such as tuberculosis
  and pneumonia.
• Without bacteria, nothing would ever decompose
  the world would be full of dead organisms.

3

• Viruses are not living organisms, they are not
  made up of cells.
• Viruses rely on the cells of living organisms to
  reproduce.
• How do we know viruses exist?
• A. In 1898, Beijerinck, a scientist, began
  experimenting with a disease on a tobacco plant
  but could not find a bacterium that was causing
  the disease.
• B. So, he concluded that the disease was being
  carried by a microbe, which he called a virus.
• Viruses were first seen through an electron
  microscope in 1939.
• Viruses cause many diseases, including the flu,
  colds, chickenpox and AIDS.

• Viruses A Group Apart