The cell theory states three principles. Which of these is NOT one of the cell theory principles?
ACells can spontaneously form from non-living matter
BCells are the basic units of structure and function
CAll living organisms are made of cells
DCells come from pre-existing cells (by division)
Answer & Solution
Correct answer: A. Cells can spontaneously form from non-living matter
The three established principles of cell theory: (1) all living organisms are made of one or more cells, (2) the cell is the basic unit of structure and function, (3) all cells come from pre-existing cells. Option D — spontaneous generation — was disproved in the 19th century (Pasteur's experiments showed life only comes from life). It is NOT part of the cell theory.
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