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Essential Idea:
Essential Idea:
There is an unbroken chain of life from the first cells on Earth to all cells in organisms alive today
There is an unbroken chain of life from the first cells on Earth to all cells in organisms alive today
Understandings:
- Cells can only be formed by division of pre-existing cells
- The first cells must have arisen from non-living material
- The origin of eukaryotic cells can be explained by the endosymbiotic theory
Applications:
- Evidence from Pasteur’s experiments that spontaneous generation of cells and organisms does not now occur on Earth
Nature of science:
Nature of science:
Testing the general principles that underlie the natural world - the principle that cells only come from pre-existing cells needs to be verified. (1.9)
Theory of knowledge:
Theory of knowledge:
Biology is the study of life, yet life is an emergent property. Under what circumstances is a systems approach productive in biology and under what circumstances is a reductionist approach more appropriate? How do scientists decide between competing approaches?
This Science 2.0 article Reductionism And Systems Thinking: Complementary Scientific Lenses is a good accessible read on how systems thinking complements the more traditional reductionist approach
Ch 1.5 Origin of cells.pptxCh 1.5 questions.docxGoogle Sites
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