Bacteria lesson 2.2

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  1. Where do you find bacteria?
    in yogurt, kitchen sponges, nose, ocean, almost everywhere.
  2. When was bacteria discovered?
    late 1600s
  3. Who discovered bacteria?
    a Dutch merchant named Anton van Leeuwenhoek
  4. What are bacteria?
    single celled organisms that are prokaryotes bacteria is the most abundant organism on earth. Pro means NO 
  5. cell membrane
    controls what materials pass into and out of the cell
  6. cytoplasm
    a region inside the cell membrane that contains gel like  material
  7. ribosomes
    chemical factories where proteins are produced
  8. flagellum
    a long, whiplike structure that helps a cell to move
  9. what three basic shapes are bacterial cells?
    • spherical
    • rodlike
    • spiral
  10. What size are bacteria?
    they vary greatly in size. They are so small that they are micrometers
  11. What things do bacteria need to survive?
    • source of food
    • a way of breaking down food to release its energy
  12. Are bacteria autotrophic or heterotrophic?
  13. respiration
    the process of breaking down food to release its energy
  14. How do bacteria reproduce?
    When they have plenty of food, the right temperature, and other suitable conditions, they thrive and reproduce frequently
  15. What types of bacterial reproduction are there?
    • asexual reproduction
    • sexual reproduction

  16. binary fision
    one cell duplicates its genetic material and divides itself to form two identical cells
  17. conjugtion
    one bacterium transfers some of its genetic material into another bacterium through a thin, threadlike bridge that joins the two cells
  18. endospore
    small, rounded, thick walled, resting cell that forms inside a bacterial cell
  19. pasteurization
    is when food is heated to a certain temperature that is high enough to kill most harmful bacteria without changing the taste of the food
  20. decomposers
    organisms that break down large chemicals in dead organisms into small chemicals
  21. why do bacteria naturally live in your intestines?
    So that they can digest food, make vitamins your body needs, 
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Bacteria lesson 2.2
2013-12-04 22:37:40
Bacteria lesson

Bacteria lesson 2.2
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