1.. Which of the following cytoskeletal motor proteins move toward the minus end

ID: 149927 • Letter: 1

Question

1.. Which of the following cytoskeletal motor proteins move toward the minus end of the filament?

a) Myosin-I
b) Myosin-II

c) Dynein

d) Kinesin-I

2 Dynamic instability

a) Is exhibited by only actin filaments.

b) Refers to the spontaneous switching between the rapid growths and shrinkages of

microtubles.

c) Refers to the rapid growth of microtubules in the absence of a GTP tubulin cap.

d) Refers to the rapid growth of microtubules in the presence of a GTP tubulin cap.

3. All proteins that interact with cytoskeletal filaments stabilize cytoskeletal filaments.
a) True
b) False

4. Muscle cells are formed from fusion of many precursor muscle cells called _____.

a) Myoblasts.

b) Glial cells.

c) Schwann cells.

d) Epithelial cells.

5. During muscle cell contraction,

a) The myosin filaments shrink.

b) The actin filaments shrink.

c) Z-discs move closer to each other.

d) Z-discs move further away from each other.

1. Dynenin -
Dyneins drive intracellular transport toward the minus end of microtubules.

2. b) Refers to the spontaneous switching between the rapid growths and shrinkages of microtubles.

3. False

4. Myoblast

5. c) Z-discs move closer to each other.

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