The '9+2' arrangement of microtubules is a structural hallmark of which cellular organelles?
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Correct answer: Cilia and flagella
Eukaryotic cilia and flagella contain an axoneme with nine peripheral doublet microtubules surrounding two central singlet microtubules (9+2 arrangement). Centrioles and basal bodies instead follow a 9+0 triplet arrangement and lack the central pair. Microvilli are supported by actin microfilaments, not a 9+2 microtubule array.
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