Who first observed and thus hypothesized that new cells are formed from previously existing living cell?
Correct answer: B. Rudolph Virchows
- A. Theodor Schwann and Schleiden
- B. Rudolph Virchows
- C. Louis Pasteur
- D. Both b and c
Explanation
Rudolf Virchow extended cell theory with the principle that every new cell arises from a pre-existing cell, expressed as omnis cellula e cellula. Louis Pasteur supported biogenesis by disproving spontaneous generation, but he did not formulate this cell-theory principle, so students may incorrectly choose d.
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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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