Fig 1.3
Fig 1.10, 1.11
Fig 1.16, 1.17
Chapter 1: What is Life?
• Hierarchy, levels of biological
structure
• Properties of life (at least 7)
• Evolution, Unity and Diversity
• Scientific Method
Life’s Hierarchical Order (figs 1.2, 2.1)







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(atoms), (organelles)
Cells
Tissues
Organs
Organism
Population *
Community *
Ecosystem *
Emergent properties
Emergent Properties:


Novel properties which
result from interactions
between components.
An organism is a living
whole, greater than the
sum of its parts.
Is it alive? (fig 1.3)



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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?
What is life?
NASA’s 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.
Examples of Cells
Homeostasis
Fig 1.8


Feedback
mechanisms of
living things
Negative Ex.



Blood glucose
levels
Body temp.
Positive Ex.


Breast feeding
Blood clotting
Domain (3)
5?
Classifying
Life
Fig 1.10


K,P,C,O,
F,G,S
General
to
specific
Fig. 1.11
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review page 11
Domains of Life (3)
1. Bacteria (prokaryotes, most ancient)
2. Archaea (prokaryotes, extreme )
3. Eukarya (eukaryotes = protists, plants,
animals, fungi)
 Hypothetico-deductive
Reasoning
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.
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
IS IT ALIVE?