Which of the following statements is true ? 1)Motor proteins are specific to act

Question

Which of the following statements is true?

1)Motor proteins are specific to actin microfilaments and microtubules (MTS); for MTS myosin and kinesin move in a directional fashion along MTS by using the inherent structural polarity of a protofilament; whereas in microfilaments (MFS) dynein moves in both directions.

2)The centrosome nucleates the microtubules in the cell and actin at the cell cortex helps govern the shape of the plasma membrane

3)Both microtubules and microfilaments have dynamic instability, and due to that instability, microtubules are used only for transient structures in a cell and actin filaments are important for cell movement

4)ATP hydrolysis is used in different ways by tubulin and actin; in a tubulin heterodimer is important for controlling the growth of a microtubule and in actin microfilaments decreases actin stability

Explanation / Answer

The statements that are true are

1) Motor proteins are specific to actin microfilaments and microtubules (MTS); for MTS myosin and kinesin move in a directional fashion along MTS by using the inherent structural polarity of a protofilament; whereas in microfilaments (MFS) dynein moves in both directions.

2) The centrosome nucleates the microtubules in the cell and actin at the cell cortex helps govern the shape of the plasma membrane

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