1. ATP binding to the Myosin-II head a) Causes the Myosin-II head to attach to t

Question

1. ATP binding to the Myosin-II head

a) Causes the Myosin-II head to attach to the actin filament.

b) Produces the power stroke for Myosin-II to move on the actin filament.

c) Causes the Myosin-II head to detach from the actin filament.

d) Causes ADP to release from the Myosin-II head.

2. Activation of RhoA GTPases in cells

a) Increases formation of stress fibers.

b) Decreases formation of stress fibers.

c) Decreases myosin activity.

d) Induces formation of lamellipodium.

3. The diameter of a microtubule is approximately ___________.

a) 7 A b) 25 A c) 7 nm d) 25 nm

4 Which of the following accelerates filament nucleation?

a) Filamin

b) Kinesin 19

c) ARP complex

d) Taxol

Explanation / Answer

1- b

2-a increase stress fibre formation

3- 25 nanometre

4- ARP complex accelerates filament nucleation

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