Multiple Choice
In the history of cell biology, what was Francesco Redi's key contribution that influenced later ideas about cell theory and the origin of life?
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1. Overview of Cell Biology
History of Cell Biology
Multiple Choice
Which statement is NOT true about the classical cell theory (as originally proposed by Schleiden, Schwann, and Virchow)?
A
All living organisms are composed of one or more cells.
B
The cell is the basic unit of structure and function in living organisms.
C
All cells arise from pre-existing cells.
D
All cells have a nucleus.
Verified step by step guidance1
Step 1: Review the three main tenets of the classical cell theory as proposed by Schleiden, Schwann, and Virchow: (1) All living organisms are composed of one or more cells, (2) The cell is the basic unit of structure and function in living organisms, and (3) All cells arise from pre-existing cells.
Step 2: Understand that the classical cell theory does not include any statement about the presence of a nucleus in all cells. This is important because some cells, such as prokaryotic cells, do not have a nucleus.
Step 3: Compare each given statement to the classical cell theory tenets. The first three statements align with the theory, while the statement 'All cells have a nucleus' does not.
Step 4: Recognize that the statement 'All cells have a nucleus' is false because it contradicts the fact that prokaryotic cells lack a nucleus, and the classical cell theory does not claim this.
Step 5: Conclude that the statement 'All cells have a nucleus' is NOT true about the classical cell theory, making it the correct answer to the problem.
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