Centrioles are composed of ________ triplets of microtubules.
Correct answer: B. 9
- A. 3
- B. 9
- C. 10
- D. 15
Explanation
A centriole has nine peripheral triplets of microtubules arranged in a cylinder, written as 9 + 0 because it lacks a central pair. The common mistake is choosing 3 by counting the microtubules in each triplet instead of counting the nine triplets around the centriole.
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