Which of the following statements about the function of the centrosome is FALSE?
ID: 216174 • Letter: W
Question
Which of the following statements about the function of the centrosome is FALSE? A) Centrosomes are the major microtubule-organizing center in animal cells. B) Centrosomes contain hundreds of copies of the ?-tubulin ring complex important for microtubule nucleation. C) Microtubules emanating from the centrosome have alternating polarity such that some have their plus end attached to the centrosome while others have their minus end attached to the centrosome. D) Centrosomes contribute to the tendency of mictotubules to be directionally oriented relative to the nucleus and the cell periphery.Which of the following statements about the function of the centrosome is FALSE? A) Centrosomes are the major microtubule-organizing center in animal cells. B) Centrosomes contain hundreds of copies of the ?-tubulin ring complex important for microtubule nucleation. C) Microtubules emanating from the centrosome have alternating polarity such that some have their plus end attached to the centrosome while others have their minus end attached to the centrosome. D) Centrosomes contribute to the tendency of mictotubules to be directionally oriented relative to the nucleus and the cell periphery.
Which of the following statements about the function of the centrosome is FALSE? A) Centrosomes are the major microtubule-organizing center in animal cells. B) Centrosomes contain hundreds of copies of the ?-tubulin ring complex important for microtubule nucleation. C) Microtubules emanating from the centrosome have alternating polarity such that some have their plus end attached to the centrosome while others have their minus end attached to the centrosome. D) Centrosomes contribute to the tendency of mictotubules to be directionally oriented relative to the nucleus and the cell periphery.
Explanation / Answer
Answer:
(C) Microtubules emanating from the centrosome have alternating polarity such that some have their plus end attached to the centrosome while others have their minus end attached to the centrosome.
Explanation:
Microtubules coming off the centrosome are polymerized by adding subunits to the plus end, just like actin filaments.
The centrosome serves as the initiation site for the assembly of microtubules, which grow outward from the centrosome toward the periphery of the cell. The initiation of microtubule growth at the centrosome establishes the polarity of microtubules within the cell.
In particular, microtubules grow by the addition of tubulin to their plus ends, which extend outward from the centrosome toward the cell periphery.
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