Multiple Choice
In the history of cell biology, how did Zacharias Janssen most directly contribute to the development of ideas that later supported cell theory?
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1. Overview of Cell Biology
History of Cell Biology
Multiple Choice
How did Rudolf Virchow contribute to the development of the cell theory?
A
He discovered the role of the nucleus in cell division.
B
He proposed that all cells arise from pre-existing cells ("Omnis cellula e cellula").
C
He first observed and named cells using a microscope.
D
He concluded that all living organisms are composed of one or more cells.
Verified step by step guidance1
Understand the historical context of cell theory, which includes key contributions from scientists like Schleiden, Schwann, and Virchow.
Recall that Rudolf Virchow's main contribution was the idea that cells do not spontaneously appear but come from the division of existing cells, summarized by the phrase "Omnis cellula e cellula."
Differentiate Virchow's contribution from others: Robert Hooke first observed cells, Schleiden and Schwann proposed that all living organisms are made of cells, but Virchow emphasized the origin of cells from pre-existing cells.
Recognize that Virchow's insight helped complete the cell theory by explaining how cells reproduce and maintain life continuity.
Summarize that Virchow's contribution is specifically about cell division and the continuity of life through cells, not the discovery of the nucleus or the initial observation of cells.
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