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1103-Lecture 2-Defining Life

1103-Lecture 2-Defining Life - Life Lecture 2 What is Life...

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Life Lecture 2
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What is Life?
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Biology The study of Life and living things
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Living or non-Living http://www.youtube.com/watch?v=mP2WE00H
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What is Life?
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How do you define Life? Animal Plant
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Definitions of life Unity of Life (7 ) -Defining Life q 1) Organization q 2) Homeostasis q 3) Responding to stimuli q 4) Metabolism q 5) Growth q 6) Reproduction q 7) Living things as a whole evolve
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1) Complex Organization
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16 Nov. 2010 Ecology-1.ppt 9 1) Complex Levels of Organization Ecosystem level Population level >Organismal level (individual) Organ system level Organ level Tissue level Cellular level Organelle level Macromolecular level Simple molecular level Atomic level
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2) Homeostasis Homeostatis- (greek)- “to stay the same” -temperature -pH -salt levels water
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3) Responding to stimuli Animals-develop elaborate sensory organs, nervous system, muscular system (responding to light, sound, touch, chemicals) Plants-growing towards light Bacteria-Chemotaxis
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4) Metabolism Plants (autotrophs) –CO 2 + H 2 O glucose and 0 2 Animals (heterotroph)- Glucose and Other compounds and break them down to energy
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5) Growth
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6) Reproduction Sexual- Asexual- Binary fission- Budding-
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7) Living things as a whole evolve
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Evolution The change genetic make up in a population due to: 1) a natural variety of alleles in an population 2) external selective pressure
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Living?
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Definitions of life
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