[Campbell Biology P.301] The drug Cytochalasin B disrupts actin filament formation. Based on... | Practice Question

The drug Cytochalasin B disrupts actin filament formation. Based on the typical animal cell cycle, which process would be most directly inhibited by this drug?

  • A: Chromosome condensation during prophase.
  • B: Attachment of microtubules to kinetochores.
  • C: Formation of the cleavage furrow during cytokinesis.
  • D: Replication of DNA in the S phase.

Explanation

Actin filaments are the primary component of the contractile ring that pinches an animal cell in two during cytokinesis, forming the cleavage furrow. Therefore, a drug that blocks actin function, like Cytochalasin B, would most directly disrupt this specific event, which is reflected in question 8 on the page.