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Transcript
section1.1.notebook
August 26, 2013
Monday, August 26
Bell Work:
What characteristics do all living things share?
1
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August 26, 2013
Biology
Unicellular
Multicellular
cells
energy
Chemical
some use chemicals from the environment
plants, algae, some bacteria use sunlight, stored as chemical energy.
Animals eat other organsims.
metabolism
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stimuli
Development
DNA
sexual reproduction
mature
grow
Reproduction
asexual
DNA
RNA
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Biosphere
-terrestrial
Biodiversity
-aquatic
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10,000
50,000
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Unifying Themes of Biology
Systems- Exist on all scales
- molecules inside cells that work to produce and
use energy
-entire biosphere
-ecosystem
-Can be two organisms interacting
6
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Structure and Function
Structure determines function!
Example: You have sharper front teeth that are for tearing
you food and flatter back teeth that are for grinding your
food.
Brain cells process information
Red Blood Cells transport oxygen
7
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Homeostasis
-Maintenance of constant internal conditions
-Cells function best under a limited range of conditions
-Ex. Temperature, blood sugar, acidity, etc.
-Breakdowns in homeostasis can be deadly
-Works through negative feedback
-you get cold, muscles cause you to shiver, blood vessels
constrict
-also behavioral- reptiles moves into sun when cold.
Page 9 (B)
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Evolution
-Changes in a species overtime
-a long term response to the environment
-Adaptations- trait or behavior that allows species to survive
and reproduce
-Accounts for unity and diversity of organisms
-different environments need different adaptations
Humans and Bacteria- both have DNA, RNA, similar source of
energy, similar cell structure
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10