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How does an animal cell pinch itself into two during cytokinesis?
AA plate of Golgi vesicles fuses
BA ring of actin filaments contracts
CA wall of cellulose is laid down
DA band of microtubules dissolves
Answer & Solution
Correct answer: B. A ring of actin filaments contracts
1. An animal cell has no cell wall, so it can simply squeeze in at the middle.
2. A ring of actin filaments assembles just under the membrane at the old metaphase plate.
3. As the ring contracts it pulls the equator of the cell inward and makes a cleavage furrow.
4. The furrow deepens until the membrane is cut in two.
5. The Golgi vesicle route is the plant cell method, which builds a wall rather than pinching.
_Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 10.2 The Cell Cycle_
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