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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

BACTERIA

A 3 ½ BILLION YEAR SUCCESS STORY

bacteria2
BACTERIA

Bacteria are prokaryotic -

which means they DO NOT have nucleus

bacteria3
BACTERIA
  • Discovered in the late 1600’s by Anton van Leeuwenhoek
  • This discovery would not have been possible WITHOUT the invention of the

MICROSCOPE

bacteria are unicellular
BACTERIA ARE UNICELLULAR
  • Bacteria come in three shapes
  • cocci -- round
  • bacilli -- rodlike
  • spirilla -- spiral shaped
structure of a bacterial cell
STRUCTURE OF A BACTERIAL CELL
  • Cell wall: surrounds and protects the cell
  • Cell membrane: inside the cell wall; controls what goes in and out
structure of a bacterial cell6
STRUCTURE OF A BACTERIAL CELL
  • Cytoplasm: gel-like material inside the cell
  • Ribosomes: protein factories
  • Genetic material: contains instructions for cell’s functions (DNA)
structure of a bacterial cell7
STRUCTURE OF A BACTERIAL CELL
  • Flagellum: (plural -- flagella) long whip like structure it helps the bacteria to move.
two kingdoms of bacteria

TWO KINGDOMS OF BACTERIA

ARCHAEBACTERIA

EUBACTERIA

kingdom archaebacteria
KINGDOM: ARCHAEBACTERIA
  • Means “ancient bacteria”
  • They live in extreme environments
  • DO NOT NEED OXYGEN
kingdom eubacteria
KINGDOM: EUBACTERIA
  • Chemically different from Archaebacteria
  • Do not live in extreme environments, but live everywhere else
  • DO NEED OXYGEN
reproduction in bacteria
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.
reproduction in bacteria14
REPRODUCTION IN BACTERIA
  • Conjugation: one bacterium transfers some of its genetic material
  • Conjugation is a form of sexual reproduction which involves two parents
survival needs of bacteria
SURVIVAL NEEDS OF BACTERIA
  • ARE BACTERIA INDESTRUCTIBLE?
  • Some bacteria can survive harsh conditions (no food, drought, poisonous wastes) by formingendospores.
survival needs of bacteria16
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.
are bacteria friend or foe
ARE BACTERIA FRIEND OR FOE?

Bacterial infections can cause death.

But that is only the beginning of the story….

bacterial friends
BACTERIAL FRIENDS
  • Lactobacillus acidophilus
  • Used for turning milk into yogurt and to preserve other dairy products
bacterial friends19
BACTERIAL FRIENDS
  • Streptomyces
  • Soil bacteria used to make streptomycin, an antibiotic used to treat bacterial infections
bacterial friends20
BACTERIAL FRIENDS
  • Pseudomonas putida
  • Cleans wastes from sewage water at water treatment plants
bacterial friends21
BACTERIAL FRIENDS
  • Escherichia coli
  • Bacteria that live in your colon and small intestine. Helps you digest your food every day.
bacteria at work
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.

bacteria at work23
BACTERIA AT WORK
  • Nitrogen fixing bacteria -- change nitrogen from the air into OXYGEN!!!
bacteria population
BACTERIA Population

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

bacteria population25
BACTERIA Population

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

Both good and bad bacteria…of course.

how can we slow bacteria down
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.

bacteria lesson of the day
BACTERIA LESSON OFTHE DAY

99% of bacteria are…

HELPFUL!!!!