Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

1. Overview of Cell Biology

History of Cell Biology

Cell Biology

1. Overview of Cell Biology

History of Cell Biology

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Multiple Choice

How did Rudolf Virchow contribute to the development of cell theory?

He coined the term 'cell' after observing cork tissue.

He first observed living cells under a microscope.

He proposed that all cells arise from pre-existing cells.

He discovered the nucleus in plant cells.

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Verified step by step guidance

Understand the context of the question: The problem is asking about Rudolf Virchow's specific contribution to the development of cell theory, so focus on his role in advancing this scientific concept.

Review the historical development of cell theory: Recall that cell theory has three main tenets: (1) All living organisms are composed of one or more cells, (2) The cell is the basic unit of structure and function in living organisms, and (3) All cells arise from pre-existing cells.

Identify Rudolf Virchow's contribution: Virchow is credited with proposing the idea that 'Omnis cellula e cellula,' which translates to 'All cells arise from pre-existing cells.' This was a critical addition to cell theory, emphasizing the continuity of life through cellular division.

Eliminate the incorrect options: (1) The term 'cell' was coined by Robert Hooke, not Virchow. (2) The first observation of living cells under a microscope was made by Antonie van Leeuwenhoek. (3) The discovery of the nucleus in plant cells was made by Robert Brown.

Conclude that the correct answer is: Rudolf Virchow's contribution to cell theory was his proposal that all cells arise from pre-existing cells, which solidified the understanding of cellular reproduction and continuity.