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The World of Microbes

The World of Microbes. A study on the stuff that makes us sick. What are Bacteria?. Bacteria are microscopic organisms They are prokaryotic They have a single cell with no true nucleus. What are bacteria?. They have no extra organelles, like other cells do

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The World of Microbes

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  1. The World of Microbes A study on the stuff that makes us sick.

  2. What are Bacteria? • Bacteria are microscopic organisms • They are prokaryotic • They have a single cell with no true nucleus

  3. What are bacteria? • They have no extra organelles, like other cells do • Some bacteria have flagella, or whip like features that help them to move

  4. A bacteria cell

  5. Types of Bacteria • Most bacteria come in one of three basic shapes: coccus, rod or bacillus, and spiral.

  6. Coccus shaped bacteria • The cocci are spherical or oval bacteria

  7. Bacilli, or Rod-shaped bacteria • Bacilli are rod-shaped bacteria

  8. Spiral shaped bacteria • Spirals come in one of three forms, a vibrio, a spirillum, or a spirochete

  9. Rod-shaped bacteria

  10. More bacteria…

  11. Because prokaryotes have a single, circular chromosome rather than the sets of chromosomes found in the more familiar eukaryotes, mitosis does not occur in prokaryotes. Instead, most replicate by a process of binary fission.

  12. What are viruses? • A virus is a microscopic organism that causes other living things to become sick. • Viruses depend on host cells that they infect to reproduce.

  13. What are viruses? • When it comes into contact with a host cell, a virus can insert its genetic material into its host, literally taking over the host's functions.

  14. So, how do viruses reproduce? • they cannot reproduce without the help of a living cell (the host cell.) • Viruses are made up of genetic materials (DNA or RNA) surrounded by a protective coat of protein. They are capable of latching onto cells and getting inside them.

  15. Types of viruses • In humans, smallpox, the common cold, chickenpox, influenza, shingles, herpes, polio, rabies, Ebola (flesh-eating virus), and HIV (an autoimmune disease) are examples of viral diseases.

  16. viruses

  17. Ebola virus

  18. HIV

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