Multiple Choice
In the context of the history of cell biology and the development of cell theory, what was Louis Pasteur’s key contribution?
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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 development of cell theory?
A
He is often credited with constructing one of the first compound microscopes, making it possible to observe cells and microorganisms.
B
He discovered the cell nucleus and proposed it controls heredity and cell division.
C
He formulated the three main tenets of cell theory, stating that all organisms are made of cells and cells arise from preexisting cells.
D
He first observed bacteria and named them “animalcules” using a simple microscope.
Verified step by step guidance1
Step 1: Understand the historical context of cell biology and the importance of technological advancements in microscopy for observing cells and microorganisms.
Step 2: Identify Zacharias Janssen's role in the development of early microscopes, specifically the compound microscope, which uses multiple lenses to magnify small objects.
Step 3: Recognize that the invention of the compound microscope was crucial because it allowed scientists to see cells and microorganisms clearly for the first time, laying the groundwork for cell theory.
Step 4: Differentiate Janssen's contribution from other key discoveries, such as the identification of the cell nucleus, formulation of cell theory, and observation of bacteria, which were made by other scientists.
Step 5: Conclude that Janssen's key contribution was the construction of one of the first compound microscopes, enabling later scientists to observe cells and develop the cell theory.
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