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Published byBailee Larner Modified over 10 years ago
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Bacteria It’s everywhere!!
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What do these two things have in common? YogurtSwiss Cheese
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What other foods can you think of that might be prepared with the aid of bacteria? Buttermilk Cottage cheese Sauerkraut Sour cream
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Not discovered until the late 1600’s. Anton van Leeuwenhoek found bacteria by accident – He made microscopes – Looked at scrapings of his teeth
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Bacteria are prokaryotes (genetic material not in a nucleus) Are still considered living
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Cell Shapes Come in three shapes – Spherical – Rodlike – Spiral
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Cell Structure The cell wall determine the shape of the bacteria and protects the cell Cytoplasm: inside the cell where genetic material is located Ribosomes: proteins are produced Genetic material contains the instructions for all the cell’s functions Flagellum: whiplike structure that helps the cell move. (spins in place like a propeller)
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2 types of bacteria Archaebacteria: live in extreme environment like the Great Salt Lake, mud at bottom of swamps, and sewage. –B–Bacteria are what cause the bad smells at these places Eubacteria: live everywhere else. Most are useful or harmless
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Reproduction of Bacteria When conditions are perfect multiply every 20 minutes Reproduce by binary fission Binary Fission: process in which one cell divides to form two identical cells. Can also reproduce by conjugation Conjugation: one bacterium transfers some genetic material to another and then seperate
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