Discussion
Consider the following statements of modern cell theory.
1. All organisms are composed of one or more cells.
2. The cell is the basic unit of structure and function in life.
3. Cells can arise spontaneously from non-living organic material.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are the first two tenets of cell theory. Statement 3 is the doctrine of spontaneous generation, which cell theory explicitly replaced - the third tenet, in Virchow’s phrase, is that every cell arises from a pre-existing cell. Pasteur’s swan-neck flask experiments settled the question for good.
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