Multiple Choice
Which of the following timelines best represents the major milestones in the development of cell theory?
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1. Overview of Cell Biology
History of Cell Biology
Multiple Choice
In the history of cell biology, how did Antonie van Leeuwenhoek contribute to the development of cell theory?
A
He proposed that all living organisms are composed of cells and that the cell is the basic unit of life.
B
He demonstrated that new cells arise only from pre-existing cells by observing cell division in animal tissues.
C
He discovered the cell nucleus and argued it controls heredity and cell division.
D
He used handcrafted microscopes to make some of the first detailed observations of living microorganisms ("animalcules"), providing evidence that cells and microscopic life exist.
Verified step by step guidance1
Understand the historical context of cell biology before Antonie van Leeuwenhoek's contributions, noting that cells were not yet observed in detail.
Recognize that Antonie van Leeuwenhoek improved microscope design by crafting high-quality lenses, which allowed him to observe tiny living organisms for the first time.
Identify that his observations of 'animalcules' (now known as microorganisms) provided the first direct evidence of microscopic life, supporting the idea that living things are composed of small units.
Note that although he did not formulate the cell theory himself, his work laid the groundwork by showing that cells and microorganisms exist and can be studied.
Conclude that van Leeuwenhoek's contribution was primarily through his pioneering use of microscopes to reveal the microscopic world, which was essential for the later development of cell theory.
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