Which of the following describes the arrangement of microtubules in the central singlets of a motile cilium?
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Correct answer: Two complete 13-protofilament microtubules
The central singlets (the '2' in 9+2) are two separate, complete microtubules, each composed of 13 protofilaments of alpha and beta tubulin. In contrast, the peripheral doublets consist of one complete (A) and one incomplete (B) microtubule.
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