Chapter 1: What is Life

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Chapter 1 What is Life?
Fig 1.3 Fig 1.10, 1.11 Fig 1.16, 1.17

• Hierarchy, levels of biological structure
• Properties of life (at least 7)
• Evolution, Unity and Diversity
• Scientific Method

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Lifes 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 arent bubbles alive? Demo
• Why arent viruses alive?

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What is life?NASAs Working Definition
of Life

• 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.

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Examples of Cells
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HomeostasisFig 1.8

• Feedback mechanisms of living things
• Negative Ex.
• Blood glucose levels
• Body temp.
• Positive Ex.
• Breast feeding
• Blood clotting

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Domain (3)
5?

• Classifying Life
• Fig 1.10
• K,P,C,O,F,G,S
• General to specific

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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.
• Drs. Mario Molina, Paul Crutzen, F. Sherwood
  Rowland. 1995 Nobel Prize
• Ozone Layer and pollutants

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IS IT ALIVE?