Question

the drug cytochalasin b blocks the function of actin. which of the following aspects of the animal cell cycle would be most disrupted by cytochalasin b?
○ spindle formation
○ spindle attachment to kinetochores
○ cleavage furrow formation and cytokinesis
○ cell elongation during anaphase

Explanation:

Cytokinesis in animal cells involves the formation of a cleavage furrow, which is driven by the actin - myosin contractile ring. Since cytochalasin B blocks actin function, it disrupts cleavage furrow formation and cytokinesis. Spindle formation (involves microtubules), spindle attachment to kinetochores (also microtubule - related), and cell elongation during anaphase (microtubule - based processes) are less affected as they are more dependent on microtubules rather than actin.

Answer:

cleavage furrow formation and cytokinesis