1. Characteristics of Living Organisms
Organization
Metabolism
Respond to Stimuli
Reproduce
Evolve

2. Living Things are Organized (Cell Theory)
all living things are composed of cells
cells are the basic units of life
cells are produced from other cells

3. Robert Hooke observed the First Cells
cork through an early microscope- illustration shown on the left.
Hooke called the individual units cells, after the monk’s rooms in a monastery.
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4. Cork Cells
Compare the photograph of cork cells viewed through a modern light microscope to Hooke’s drawing.
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5. Plant Cell Light Microscope
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6. Animal Cell Light Image
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7. Animal Cell EM Image
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8. Animal Tissue
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9. Plant Tissue
What two structures do plant cells have that animal cells lack?
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10. The cell is the basic unit of life.
Anton van Leeuwenhoek ( )

11. Single Cell Life Form
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12. Cells come from cells.
Rudolf Ludwig Karl Virchow ( )

13. so…to review cell theory
All life forms are made from one or more cells.
Cells only arise from pre-existing cells.
The cell is the smallest form of life.

14. cells tissues organs systems individuals populations communities ecosystems biosphere

15. Living Things Metabolize
Metabolism is the sum of all of the chemical and energy transformations that take place in an organism.

16. Homeostasis is the maintenance of internal conditions within certain boundaries.

17. Respond to Stimuli
Organisms react in the presence of appropriate stimuli physiologically and behaviorally.

18. Living Things Reproduce
All living things come from other living things.
Living things make copies of themselves; to do so they pass on genes.

19. Living Things Evolve
Evolution is change in characteristics of populations/species over time resulting from mutation & natural selection.
These changes result in adaptations (characteristics that increase the likelihood that species survive and reproduce).