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

Question

Which of the following statements about microtubule growth in cells is false? A) microtubule growth is dependent on the gamma-tubulin ring complex. B) GTP-bound alpha- and beta-tubulin dimers add on to the minus ends of microtubules C)microtubules undergo dynamic instability D) microtubules are stabilized by being captured at the cell cortex. Which of the following types of intermediate filaments is found in epithelia? A) Lamins B) Keratin C) Vimentin D) Neurofilaments Which of the following is not a cellular function of microtubules? A) Organelle positioning B) Movement of cilia C) Transport of vesicles D) Strengthening of the axon Which of the following proteins allow(s) cells to adhere to collagen? A) laminin B) fibronectin C) integrin D) integrin and laminin E) integrin and fibronectin Which of the following structures contains tight bundles of actin? A) membrane ruffles B) lamellipodia C) pseudopodia D) filopodia Microtubules are known to grow ou

Explanation / Answer

1. Microtubules are stabalized by being captured at the cell cortex. Generally Taxol stabalizes micro tubules where tubulin has a straight confirmation so that protofilaments are locked together at the ends.

2. keratins are the ones found in the epithelia cells

3. Strenghtening of the axon: neurofilaments have this role which has intermediate filaments also in its component.

7. tubulin dimers undergo treadmilling. This means microtubules flow towards the poles which does not happen in Dynamic instability. Here the shrinkage and rescue happens at poles only due to linkage at the poles. .

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