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What is life?? PowerPoint PPT Presentation


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What is life??. Alive?? More than just a list?? Materialism vs vitalism Energy capture/use Irritability Grow/reproduce Evolve/adapt. DNA, Energy & Life. All organisms have DNA…why?? Energy used to organize Life Levels of organization cells---biosphere Energy used, matter is recycled!.

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What is life??

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What is life??

  • Alive??

  • More than just a list??

  • Materialism vs vitalism

  • Energy capture/use

  • Irritability

  • Grow/reproduce

  • Evolve/adapt


DNA, Energy & Life

  • All organisms have DNA…why??

  • Energy used to organize Life

  • Levels of organization cells---biosphere

  • Energy used, matter is recycled!


DNA, Energy & Life

  • Ecology

  • Diversity…so many??

  • 6 Kingdoms…now!

  • How many Species?

  • Future of Diversity?

  • Similar but different?


Systems

Organism

Population

Community

Ecosystems

biosphere

Atoms

Molecules

Organelles

Cells

Tissues

Organs

Levels of biological organization


Interdependence of all life

  • Energy flows from sun

  • To producers (autotrophs)

  • Which are consumed

  • Decomposers recycle the molelcules but not the energy

  • Life exists at the expense of other life…


Unity in diversity??

  • Biochemical/cellular threads in life’s tapestry =1.5 million species to date!!

    • archaebacteria

    • Eubacteria

    • Protista

    • Fungi

    • Plants

    • animals


Evolution

  • Change…change…&

  • Why so much diversity?

  • Fossils??

  • What do mutations mean?

  • Natural Selection


Doing Science

  • Knowledge vs Certainty …why it matters

  • Reductionism…?

  • Skepticism…inquiry?

  • Controls & variables

  • Open epistemology!!

  • Limits of science…?


The Scientific Method

  • Observations=seeing?

  • Explanation(s)..if/then

  • Test predictions

  • Revise or accept

  • Repeat…why?

  • ‘Just a theory’???

    reliable…but

    not absolute!!!


How would you evaluate her?

The human condition is complex and there are many ways of ‘knowing’!


What is an hypothesis?

Explain nat’l selection

List 4 characteristics of living things?

What is reductionism?

Metabolism=?

Energy is ‘used up’ but matter is…..?

List 6 kingdoms

List levels atoms to ecosphere

Quiz


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