Which of the following statements about growth in cells is false? A) microtubule

Question

Which of the following statements about growth in cells is false? A) microtubule growth is dependent on the gamma ring complex B_ GTP- alpha and beta add on to the minus ends of microtubules C) microtubules D) microtubules are by being captured at the cell cortex. Which of the following types of intermediate filaments is found in ? A) Larnins B) Kerstin C) Vimentin D) Neurofilaments Which of the following is not a cellular function of microtubules? A) Organelle positioning Movement of Transport of vehicles strengthening of the across Which of the following proteins allow (s) cells to adhere to-collagen? A) laminin B) fibronectin C) integrin D) E) Which of the following structures contain fight bundles of actin? A) membrane ruffles B) lamellipodia C) pseudopodia D) filopodia are known to grow out from an organizing center. Which of the following is organizing center? A) B) poles of the C) D) basal body in a cell Which of the following is no

Explanation / Answer

Answer:

1.

Correct option: D) microtubules are stabilized by being captured at the cell coortex.

2.

Correct option: B) Keratin

3.

Correct option: D) Strengthening of the axon

Explanation: A type of intermediate filament called neurofilaments are found in high concentration along the axons of vertebrate neurons and strengthen them.

4.

Correct option: E) integrin and fibronectin

Explanation: Fibronectin connect cells with collagen fibers in the extracellular matrix. Fibronectins are secreted by cells in an inactive form. They bind to integrins to function pproperly.

5.

Correct option: D) Filopodia

Explanation: Filopodia is a dynamic structure formed at the cell periphery. Filopodia are needle shaped and contain a tight bundle of loong actin filaments.

6.

Correct option: C) desmosome

Explanation: It is a cell structure specialised for cell-to-cell adhesion. It is not an organising center for microtubules.

7.

Correct option: B) Addition of GTP-bound tubulin dimers forms a GTP cap.

Explanation: Cap of GTP- bound tubulin at the tip of the microtubule, protects it from disassembly. So, it promotes stability to the microtubule.

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