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Monerans

Monerans. Oldest Life on Earth Mr. Kempfer 7 th Grade Science. Monerans. Single celled No nucleus Most commonly known as Bacteria Appeared 3.5 billion years ago Most numerous organism 2.5 billion bacteria in a gram of soil How are bacteria different from other cells?.

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Monerans

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  1. Monerans Oldest Life on Earth Mr. Kempfer 7th Grade Science

  2. Monerans • Single celled • No nucleus • Most commonly known as Bacteria • Appeared 3.5 billion years ago • Most numerous organism • 2.5 billion bacteria in a gram of soil • How are bacteria different from other cells?

  3. Types of Bacteria • Shapes of bacteria • Coiled, ball, rod, candy-apple, blobs • Can be any color • Red, yellow, blue, purple • Found in water, air, soil and other organisms

  4. Amazing Bacteria • Some bacteria live in volcanoes, boiling water, glaciers, acid pools and at very high pH’s • Bacteria are simple but still perform all of the functions necessary for life. • How would this be an advantage on early Earth?

  5. Structure of Bacteria • Have a cell wall • Protects and gives shape • Cell Membrane • Lets stuff in and out • Cytoplasm • No nucleus • Genetic material just floats in the cytoplasm • What parts do bacteria share with other cells?

  6. Movement of Bacteria • Most bacteria can’t move on their own. • Moves by air, water or hitches a ride • Some have flagellum • Whip like tails that propel them through a liquid. • Why do bacteria need to move?

  7. Life Functions of Bacteria • Some need oxygen, some don’t • Most are heterotrophs • Some are parasites • Some are decomposers • Some are autotrophs • Some eat sulfur and iron • Why do you think bacteria are so diverse?

  8. Reproduction • Bacteria reproduce by splitting into 2 • Can double their numbers in 20 minutes • In 24 hours could weigh 2 million kilograms!!! • In 5 days would weigh more than the Earth!!! ?What keeps this from happening?

  9. Bacteria in Control • Reproduction depends on food supply. • When there’s no food, bacteria form an endospore. • This is like a suit of armor against the environment • Bacteria can survive bleach, boiling, freezing and radiation in an endospore • When would a bacteria need an endospore?

  10. Bacteria in Nature • Bacteria are an essential part of the food and energy relationships that link all life on Earth. • Decomposers, Producers, food for consumers • Oxygen producers • Why is this important?

  11. Pioneers • Bacteria are the first to move into a new area and populate it. • Volcanic areas • Forest fires • Symbiotic Relationships • Help us digest food • Give plants nitrogen • How does this help an ecosystem?

  12. Bacteria and Humans • Bacteria are used in the production of food, fuel, medicines and other products. • Some, though, can spoil food, cause diseases and poison water. • Name a bad bacteria.

  13. Bacteria and Food • Used to make cheese, yogurt, pickles, sour cream, soy sauce, vinegar, high-fructose corn syrup (sugars) • Blue-green algae are 70% protein…yum! • We heat food to kill bad bacteria • What can bad bacteria do to food?

  14. Bacteria as Fuel • Certain bacteria can break down fruit rinds, dead plants, manure and sewage to make methane gas (natural gas) • Dead bacteria and other stuff became crude oil in time

  15. Medicine • Bacteria is used to make anitbiotics • Chemicals that poison other bad bacteria • Bacteria can cause … • Strep throat, pneumonia, tetanus and Lyme disease. • Can antibiotics fight a virus?

  16. Bacteria and Industry • Used to tan leather • Extract copper, silver and gold from rock • Coloring food, cosmetics, removing stains and changing chemicals. • Damages asphalt, water and gas pipes and oil drilling machinery.

  17. Up Next… Protists

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