Multiple Choice
In the development of the cell theory, what key contribution did Matthias Schleiden make?
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1. Overview of Cell Biology
History of Cell Biology
Multiple Choice
In the history of cell biology, what was Zacharias Janssen's key contribution that helped enable later discoveries leading to cell theory?
A
He is often credited with inventing (or helping invent) the first compound microscope, allowing magnified observation of tiny structures.
B
He discovered and named the cell after observing cork under a microscope.
C
He proposed that all living organisms are composed of cells and that cells arise from pre-existing cells.
D
He first observed living cells ("animalcules") and described their motility in pond water.
Verified step by step guidance1
Identify the key historical figures and their contributions related to the development of cell biology.
Understand that Zacharias Janssen is historically credited with inventing or helping invent the first compound microscope, which was crucial for magnifying tiny structures.
Recognize that this invention allowed later scientists, such as Robert Hooke and Antonie van Leeuwenhoek, to observe cells and microorganisms, leading to foundational discoveries in cell theory.
Distinguish Janssen's contribution from others: Robert Hooke named the cell after observing cork, Rudolf Virchow proposed that cells arise from pre-existing cells, and Leeuwenhoek observed living cells ('animalcules').
Conclude that Janssen's key contribution was the development of the compound microscope, enabling magnified observation that paved the way for all subsequent cell biology discoveries.
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