During cytokinesis in animal cells, which cytoskeletal element primarily forms the contractile ring that pinches the cell membrane inward?

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Multiple Choice

During cytokinesis in animal cells, which cytoskeletal element primarily forms the contractile ring that pinches the cell membrane inward?

Actin filaments form the contractile ring that pinches the cell membrane inward during cytokinesis. These filaments assemble beneath the plasma membrane at the cell’s equator to create a belt-like ring. Myosin II motors interact with this actin network and, using ATP, slide the actin filaments past one another to tighten the ring, pulling the membrane inward to form the cleavage furrow and split the cell. Microtubules help organize and position the ring, while intermediate filaments provide structural support, but the actual contractile structure responsible for constriction is made of actin filaments.

During cytokinesis in animal cells, which cytoskeletal element primarily forms the contractile ring that pinches the cell membrane inward?

Prepare for the Texas Math and Science Coaches Association (TMSCA) Science Exam. Use flashcards and targeted quizzes to grasp key concepts. Each question comes with detailed explanations to enhance understanding. Empower your prospects in TMSCA Science today!

During cytokinesis in animal cells, which cytoskeletal element primarily forms the contractile ring that pinches the cell membrane inward?

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