Multiple choice

Cytokinesis is the physical process of cell division, which divides the cytoplasm of a parental cell into two daughter cells. Which of the following statements regarding the cytokinesis is FALSE?

  1. It begins shortly after the onset of sister chromatid separation.

  2. A contractile ring, made of muscle myosin II and actin filaments assembles parallelly at the cell cortex.

  3. The process of abscission physically cleaves this midbody into two.

  4. Abscission depends on septin filaments.

  5. The position at which the contractile ring assembles is dictated by the mitotic spindle.
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B Correct answer
Explanation

A contractile ring, made of non-muscle myosin II and actin filaments, assembles equatorially (in the middle of the cell) at the cell cortex (adjacent to the cell membrane). Myosin II uses the free energy released when ATP is hydrolysed to move along these actin filaments, constricting the cell membrane to form a cleavage furrow.

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