Multiple Choice
During mitosis in animal cells, which organelle serves as the microtubule-organizing center that anchors the spindle fibers at each pole?
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15. Cytoskeleton and Cell Movement
Microtubules and Cell Division
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In animal cells, the mitotic spindle arises primarily from which cell structure?
A
The rough endoplasmic reticulum, which anchors spindle microtubules to the nuclear envelope
B
The centrosomes (microtubule-organizing centers containing a pair of centrioles)
C
The Golgi apparatus, which nucleates microtubules for chromosome movement
D
The nucleolus, which polymerizes tubulin into spindle fibers during prophase
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