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5 cards from this section. Quick, good the night before a test.
State the third principle of the cell theory.
Virchow summed it up as 'every cell from a cell'.
What was spontaneous generation?
'Spontaneous' means happening by itself.
Which scientist used swan-neck flasks to show that microbes come from other microbes?
He is also known for pasteurisation.
Which Latin phrase sums up the principle that all cells come from pre-existing cells?
Look for the word 'cellula'.
Design a controlled experiment, in the spirit of Pasteur's, to test whether microbes that grow in a sugar solution come from the air or arise from the solution itself. State your independent, dependent and control variables, and the results you would expect if microbes come from the air.
Make sure that air can reach the solution in every flask, so that the only difference is whether microbes can reach it.
Explain why it took about two hundred years, from Redi's experiment in 1668 to Pasteur's around 1860, for scientists to abandon spontaneous generation completely.
Think about the discovery of microbes and about the objections each experiment had to answer.
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