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Bacteria

Bacteria. Title. Do Disinfectants Work?. Purpose. Determine how well disinfectants control the growth of bacteria. Research. Bacteria are prokaryotes. Genetic Material in their cells is not contained in a nucleus. (prokaryote: no nucleus/bacteria) 2. Bacteria, living unicellular organism

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Bacteria

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  1. Bacteria

  2. Title Do Disinfectants Work?

  3. Purpose Determine how well disinfectants control the growth of bacteria.

  4. Research • Bacteria are prokaryotes. Genetic Material in their cells is not contained in a nucleus. (prokaryote: no nucleus/bacteria) 2. Bacteria, living unicellular organism 3. Three shapes spherical: cocci rodlike: bacilli spiral: spirilla 4. Shape determined by composition of cell wall

  5. 5. Flagellum, long whip-like structure that extends from the cell membrane out the cell wall. 6. Flagellum help the cell to move, like kicking you legs in water. 7. Bacteria may have many, one or none. 8. If bacteria have none, can not move on their own.

  6. Kingdoms Classified: 2 Kingdoms

  7. Archaebacteria ~ ancient bacteria ~ Been around before dinosaurs. Resembles Earth’s first life forms. ~ Live in extreme environments extreme heat: hot springs extreme acid: lemon juice extreme salt: Utah Great Salt Lake extreme moist: bottom of swamps extreme waste: sewage systems. This bacteria is responsible for the foul smells

  8. Eubacteria ~ Can not handle extreme conditions ~ They live everywhere else ~ Help maintain some of Earth’s physical conditions, helping other organisms to survive. Scientist think, these bacteria, are responsible for the formation of Earth’s atmosphere. Being autotrophic, making their own food, their by-product was oxygen. Descendants of these bacteria are responsible for about 20% of our oxygen

  9. Hypothesis How do you think disinfectants work? Do they really work?

  10. Experiment • On the closed / taped lid of your petri dish, draw a line down the middle with a sharpie marker. • Label one side D the other C • Person A, will swab the table in a random place in a zigzag pattern • Person B, open the lid of the petri dish, zigzagthe swab down the D side. Do not poke the swab in the agar. Cover petri dish quickly. 5. Person C, use antibacterial cleaner washing the swabbed place. 6. Person D, repeat step 4, only zigzag down the C side.

  11. Data/ Analysis Draw and record your data in the following

  12. Conclusion • How did the appearance of each side change during this lab? • How did side D and side C compare? Explain any similarities or differences. • Based on the results of this lab, what recommendation would you make to your family about the use of disinfectants? Where in the house do you think this product would be needed most?

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