chapter 1: what is life? • hierarchy, levels of biological structure
DESCRIPTION
Life’s Hierarchical Order (figs 1.2, 2.1) (atoms), (organelles) Cells Tissues Organs Organism Population * Community * Ecosystem * Emergent propertiesTRANSCRIPT
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Chapter 1: What is Life?
• Hierarchy, levels of biological structure• Properties of life (at least 7)• Evolution, Unity and Diversity• Scientific Method
Fig 1.3
Fig 1.10, 1.11
Fig 1.16, 1.17
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Life’s Hierarchical Order (figs 1.2, 2.1)
(atoms), (organelles) Cells Tissues Organs Organism Population * Community * Ecosystem *
Emergent properties
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Emergent Properties:
Novel properties which result from interactions between components.
An organism is a living whole, greater than the sum of its parts.
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Is it alive? (fig 1.3) Organisms are open systems & interact
with their environment Fig 1.3 lists 7 common characteristics
Why aren’t bubbles alive? Demo… Why aren’t viruses alive?
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Life is capable of metabolism, (chemical reactions which utilize energy and also synthesize its cellular constituents.) Second, life is capable of self replication. Third, life can evolve in order to adapt to environmental changes. Life is a community of organisms which must interact with their nonliving environment through processes called biogeochemical cycles.
What is life?NASA’s Working Definition of Life
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Examples of Cells
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Feedback mechanisms of living things
Negative Ex. Blood glucose
levels Body temp.
Positive Ex. Breast feeding Blood clotting
HomeostasisFig 1.8
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Classifying Life
Fig 1.10
K,P,C,O,F,G,S
General to specific
Domain (3)5?
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Fig. 1.11 review page 11
Domains of Life (3) 1. Bacteria (prokaryotes, most ancient) 2. Archaea (prokaryotes, extreme ) 3. Eukarya (eukaryotes = protists, plants,
animals, fungi)
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Hypothetico-deductive Reasoning
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Sources
Campbell, Reece, Mitchell. Biology, 5th Ed. 1999, Chapter one. Pgs. 1-21.
Campbell, Reece, Mitchell. Biology, 5th Ed. 1999, Presentations CD-ROM.
Click art CD-ROM, Broderbund.
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Unit One, the Chemistry of Life
T.O.D. Dr’s. Mario Molina, Paul Crutzen, F.
Sherwood Rowland. 1995 Nobel Prize Ozone Layer and pollutants
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IS IT ALIVE?