Roots of Life: Chapter 2 Section 2: Bacteria
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WHERE DO YOU FIND BACTERIA?
- kitchen sponge
- in your nose
- Everywhere: under rocks, ocean, your body
WHAT ARE BACTERIA?
single-celled organisms that lack a nucleus, prokaryotes
rigid cell wall that protects the cell
region inside the cell membrane that contains a gel-like material
tiny structures inside the cytoplasm that are chemical factories where proteins are produced
long, whip-like structure that helps a cell to move
WHAT ARE THE 3 BASIC SHAPES OF BACTERIA?
- 1 spherical
- 2 rod-like
- 3. spiral
WHAT SIZE ARE BACTERIA?
.5-1 micrometer in diameter. Largest one would fit on a period a the end of a sentence
WHAT DO BACTERIA NEED TO SURVIVE?
- 1 source of food
- 2 a way of breaking down food to release its energy
ARE BACTERIA AUTOTROPHIC OR HETEROTROPHIC?
The process of breaking own food to release its energy
HOW DO BACTERIA REPRODUCE?
when they have plenty of food, the right temperature, and other suitable conditions, they thrive and reproduce frequently
WHAT TYPES FO BACTERIAL REPRODUCTION ARE THERE?
- asexual reproduction
- sexual reproduction
asexual reproduction when a bacterial cell divides into two identical cells
A process of sexual reproduction when two parents combine their genetic material to produce another organism. After the transfer of material the cells separate. The new bacteria are genetically different than parent cells.
A small, rounded thick-walled resting cell that forms inside a bacterial cell
process of heating food to a temperature that is high enough to kill most harmful bacterial without damaging the taste of the food (invented by Louis Pasteur)
NAME SOME ANCIENT FOOD PRESERVATION METHODS THAT USED BACTERIA
- pickled vegetables
- dried meat
- sourdough bread
organisms that break down large chemicals in dead organisms into small chemicals. They are "nature's recyclers". They return basic
WHAT ARE NITROGEN-FIXING BACTERIA?
bacteria the convert nitrogen gas from the air into nitrogen products that plants need to grow.
WHY DO BACTERIA NATURALLY LIVE IN YOUR INTESTINES?
to help you digest your food
What would you like to do?
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