The statement that all cells arise from pre-existing cells was added to the cell theory by
Correct answer: C. Rudolf Virchow
- A. Robert Hooke
- B. Schleiden and Schwann
- C. Rudolf Virchow
- D. Anton van Leeuwenhoek
Explanation
Schleiden and Schwann established that plants and animals are made of cells, but it was Virchow who added in 1855 that every cell comes from the division of another, which ruled out spontaneous generation. Hooke first used the word cell after looking at cork, and Leeuwenhoek first saw living microorganisms. The three statements together form the modern cell theory.
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About Animal and Plant Cell
Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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