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BACTERIA A 3 ½ BILLION YEAR SUCCESS STORY BACTERIA Bacteria are prokaryotic - which means they DO NOT have nucleus BACTERIA Discovered in the late 1600’s by Anton van Leeuwenhoek This discovery would not have been possible WITHOUT the invention of the MICROSCOPE

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BACTERIA

A 3 ½ BILLION YEAR SUCCESS STORY


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BACTERIA

Bacteria are prokaryotic -

which means they DO NOT have nucleus


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BACTERIA

  • Discovered in the late 1600’s by Anton van Leeuwenhoek

  • This discovery would not have been possible WITHOUT the invention of the

    MICROSCOPE


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BACTERIA ARE UNICELLULAR

  • Bacteria come in three shapes

  • cocci -- round

  • bacilli -- rodlike

  • spirilla -- spiral shaped


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STRUCTURE OF A BACTERIAL CELL

  • Cell wall: surrounds and protects the cell

  • Cell membrane: inside the cell wall; controls what goes in and out


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STRUCTURE OF A BACTERIAL CELL

  • Cytoplasm: gel-like material inside the cell

  • Ribosomes: protein factories

  • Genetic material: contains instructions for cell’s functions (DNA)


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STRUCTURE OF A BACTERIAL CELL

  • Flagellum: (plural -- flagella) long whip like structure it helps the bacteria to move.


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TWO KINGDOMS OF BACTERIA

ARCHAEBACTERIA

EUBACTERIA


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KINGDOM: ARCHAEBACTERIA

  • Means “ancient bacteria”

  • They live in extreme environments

  • DO NOT NEED OXYGEN


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KINGDOM: EUBACTERIA

  • Chemically different from Archaebacteria

  • Do not live in extreme environments, but live everywhere else

  • DO NEED OXYGEN


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REPRODUCTION IN BACTERIA

  • Binary fission: a process in which one cell divides to form two identical cells

  • Binary fission is a form of asexual reproduction

  • Asexual reproduction involves only one parent. Offspring are identical to the parent.


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REPRODUCTION IN BACTERIA

  • Conjugation: one bacterium transfers some of its genetic material

  • Conjugation is a form of sexual reproduction which involves two parents


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SURVIVAL NEEDS OF BACTERIA

  • ARE BACTERIA INDESTRUCTIBLE?

  • Some bacteria can survive harsh conditions (no food, drought, poisonous wastes) by formingendospores.


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SURVIVAL NEEDS OF BACTERIA

  • Endospore: structure that allows the bacteria to survive hostile conditions.

  • An endospore is a sack around the DNA which protects it.


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ARE BACTERIA FRIEND OR FOE?

Bacterial infections can cause death.

But that is only the beginning of the story….


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BACTERIAL FRIENDS

  • Lactobacillus acidophilus

  • Used for turning milk into yogurt and to preserve other dairy products


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BACTERIAL FRIENDS

  • Streptomyces

  • Soil bacteria used to make streptomycin, an antibiotic used to treat bacterial infections


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BACTERIAL FRIENDS

  • Pseudomonas putida

  • Cleans wastes from sewage water at water treatment plants


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BACTERIAL FRIENDS

  • Escherichia coli

  • Bacteria that live in your colon and small intestine. Helps you digest your food every day.


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BACTERIA AT WORK

Bacteria are used as one of the tools to clean up oil spills. The bacteria EAT the oil, turning it into carbon dioxide.


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BACTERIA AT WORK

  • Nitrogen fixing bacteria -- change nitrogen from the air into OXYGEN!!!


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BACTERIA Population

There ARE more bacteria in your mouth than all of the humans on Earth.


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BACTERIA Population

There are over 100 million bacteria on ONE square inch of your skin.

Both good and bad bacteria…of course.


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How can we slow bacteria down…

A YOGURT a day keeps the doctor away. By eating good bacteria found in some foods you can stay healthier.

If you DO get a bacterial infection antibiotics CAN help…they CANNOT help a virus.


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BACTERIA LESSON OFTHE DAY

99% of bacteria are…

HELPFUL!!!!


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