Multiple Choice
In mitosis, what is the primary role of spindle fibers (microtubules) during anaphase?
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15. Cytoskeleton and Cell Movement
Microtubules and Cell Division
Multiple Choice
During mitosis in an animal cell, what happens to the centrioles (within the centrosomes)?
A
They fuse together at the metaphase plate to form a single spindle pole.
B
They separate and move to opposite poles of the cell, helping organize the mitotic spindle.
C
They disassemble into free tubulin dimers so microtubules can form.
D
They replicate during prophase, producing two new pairs of centrioles.
Verified step by step guidance1
Understand the role of centrioles in animal cell mitosis: Centrioles are cylindrical structures found within the centrosomes, which serve as the main microtubule organizing centers in animal cells.
Recall the behavior of centrioles during mitosis: Before mitosis begins, centrioles replicate so that there are two pairs present in the cell.
Identify the movement of centrioles during mitosis: During prophase and prometaphase, the two pairs of centrioles separate and move toward opposite poles of the cell.
Recognize the function of centrioles at the poles: Once at opposite poles, centrioles help organize the mitotic spindle by nucleating microtubules that attach to chromosomes and facilitate their segregation.
Note what centrioles do not do: They do not fuse at the metaphase plate, nor do they disassemble into tubulin dimers during mitosis.
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