The origin of cells

Topic 1.5

Essential idea: There is an unbroken chain of life from the first cells on Earth to all cells in organisms alive today.

Understandings

1.5.U1 Cells can only be formed from pre-existing cells

Cell Theory

1.5.U2 The first cells must have arisen from non-living material

Origin of cells from non-living material

1.5.U3 The origin of cells can be explained by the endosymbiotic theory

Explanation of the endosymbiotic theory

Applications

1.5.A1 Evidence from Pasteur's experiments that spontaneous generation of cells and organisms does not now occur on Earth

Experiment 1:

Pasteur's first experiment

Experiment 2:

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Pasteur's second experiment

Conclusion:

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Pasteur's second experiment
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