Answer: retain its shape; divide
Explanation: In a wide range of cell type, networks of actin filaments aid in supporting and strengthening the plasma membrane this allowing the cells to hold — and move — specialized shapes. They also play active roles in cytokinesis and cell movement.
Cytochalasin targets actin filaments in the cytoskeleton, preventing them from forming thus inhibiting a wide variety of cellular movements (cytokinesis, cell locomotion, cytoplasmic streaming, blood clot retraction etc.). As a consequence,
cytochalasins can disrupt cellular morphology, cell division, and even cause cell death.