Cell Biology: Prokaryotic versus Eukaryotic Cells · Cell Theory and Features Shared by All Cells
How cell theory took shape and which features, limits and molecules every cell has in common.
Cell Biology · 26 questions
Try 3 questions
1. In 1665, who first used the word "cell" after viewing thin slices of cork under a microscope?
- Matthias Schleiden
- Antonie van Leeuwenhoek
- Robert Hooke
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Answer: Robert Hooke
Hooke described cork's tiny compartments in Micrographia and named them cells, after the small rooms monks lived in.
2. What was Hooke actually seeing when he looked at his famous cork "cells"?
- Living cells with visible nuclei
- Empty walls of dead plant cells
- Bacteria living inside the bark
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Answer: Empty walls of dead plant cells
Cork is dead tissue, so only the rigid cell walls remained; the living contents were long gone.
3. Rudolf Virchow popularized the phrase "omnis cellula e cellula". What does this principle of cell theory state?
- New cells arise only from existing cells
- Cells can assemble from nonliving matter
- Every cell must contain a nucleus
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Answer: New cells arise only from existing cells
Virchow argued that cells come only from the division of preexisting cells, rejecting the idea that they form spontaneously.
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