Multiple Choice
Which statement best describes the second principle of the classical cell theory?
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1. Overview of Cell Biology
History of Cell Biology
Multiple Choice
In the history of cell biology, what was Antonie van Leeuwenhoek’s key contribution that helped advance ideas leading to cell theory?
A
He formulated the three main tenets of cell theory and presented them as a unified theory.
B
He was among the first to observe and describe living single-celled organisms (“animalcules”) such as bacteria and protists using improved microscopes.
C
He proposed that all cells arise only from preexisting cells (biogenesis).
D
He identified the cell nucleus and described it as a defining cellular structure.
Verified step by step guidance1
Understand the historical context of cell biology and the development of cell theory, which was built upon observations made by early scientists.
Recognize that Antonie van Leeuwenhoek's key contribution was related to microscopy and the observation of living cells, rather than formulating the cell theory itself or identifying cellular structures like the nucleus.
Recall that van Leeuwenhoek improved the design of microscopes, allowing him to observe tiny living organisms, which he called 'animalcules,' including bacteria and protists, for the first time.
Connect how these observations provided crucial evidence that living organisms are composed of cells, thereby advancing the ideas that eventually led to the formalization of cell theory.
Distinguish van Leeuwenhoek's contribution from other milestones, such as the formulation of the three tenets of cell theory or the concept of biogenesis, which were developed later by other scientists.
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