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87. A researcher treats a culture of dividing animal cells with the drug cytochalasin B, which selectively inhibits the polymerization of actin microfilaments. The immediate operational outcome observed in these cells will be the

A. Total arrest of nuclear envelope breakdown during prophase
B. Complete failure of cytokinesis, leaving binucleated cells
✓
C. Inhibition of chromosome movement toward the spindle poles
D. Disruption of the mitochondrial electron transport chain

📝 Explanation

Inhibiting actin prevents the assembly of the contractile ring, blocking cleavage furrow formation and leaving the cell with two nuclei.

📖 Additional Information

  • Total arrest of nuclear envelope breakdown during prophase
  • Complete failure of cytokinesis, leaving binucleated cells
  • Inhibition of chromosome movement toward the spindle poles
  • Disruption of the mitochondrial electron transport chain

Inhibiting actin prevents the assembly of the contractile ring, blocking cleavage furrow formation and leaving the cell with two nuclei.

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