49. During cell division the contractile ring pulls inward on the plasma membran

Question

49. During cell division the contractile ring pulls inward on the plasma membrane and eventually splits a dividing cell into two daughter cells. Force generation by the contractile ring requires that microfilaments within the ring slide past each other as the diameter of the ring gets progressively smaller and smaller. It has been observed that myosin-II is required to generate this force and that myosin-I will not suffice.Based on what you know about the structure and function of myosin-I and myosin-II, suggest an explanation for this observation.

Explanation / Answer

myosin-I and myosin-II, are used in cytokinesis of cell division.

myosin-II plays role in muscle contraction . and generates the energy for contraction by ATP hydrolysis.hence microfilaments within the ring slide past each other as the diameter of the ring gets progressively smaller and smaller.

myosin-II is more chains(two light $ two heavy chains ) than myosin-I

myosin-I is having shorter light chain,during contraction myosin-I is sufficed

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