What are bacteria? How are they classified? Are they good or bad? Warm Up.
Bacteria - WordPress.comBACTERIA They thrive in your container of yogurt They lurk in your kitchen...
Transcript of Bacteria - WordPress.comBACTERIA They thrive in your container of yogurt They lurk in your kitchen...
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BACTERIA
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BACTERIA
They thrive in your container of yogurt
They lurk in your kitchen sponge
They coat your skin and warm inside your nose
There are more bacteria in your mouth than
there are people on Earth!
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THE BACTERIAL CELL
Bacteria were discovered in the late 1600s
Anton van Leevenhoek found them by accident
His hobby was making microscopes
He was looking at scrapings from his teeth
He saw some tiny, wormlike organisms in the
sample
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CELL STRUCTURES
Bacteria are prokaryotes, the genetic material
in their cells is not contained in a nucleus
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CELL SHAPES
One of three basic shapes
Spherical
Rodlike
Spiral
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OBTAINING FOOD AND ENERGY
Bacteria must have a source of food and a way
of breaking down the food to release its energy
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OBTAINING FOOD
Some bacteria are autotrophs and make their
own food
Some capture and use the sun’s energy as plants
do
Others use energy from chemical substances in
their environment to make their food
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OBTAINING FOOD
Some bacteria are heterotrophs and cannot
make their own food
They must consume other organisms or the
food that other organisms make
From milk and meat to decaying leaves on the
forest floor
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