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Cilia and flagella exhibit the characteristic '9 + 2' arrangement of:
AMicrofilaments (actin protein, thinnest)
BMicrotubules (tubulin protein, hollow cylindrical)
CIntermediate filaments (keratin family)
DCentriole triplets (9 + 0 arrangement)
Answer & Solution
Correct answer: B. Microtubules (tubulin protein, hollow cylindrical)
Cilia + flagella: 9 OUTER PAIRS of microtubules + 2 CENTRAL microtubules ('9+2'). Centrioles: 9 triplets, no central pair ('9+0'). All made of tubulin. Both used in motility + signalling.
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