Practice question
Question
Two cylindrical structures are examined:
Structure P has nine peripheral microtubule doublets and two central microtubules.
Structure Q has nine peripheral microtubule triplets connected to a central hub by radial spokes.
Which identification is correct?
Explanation
The axoneme of a eukaryotic cilium or flagellum usually has a 9+2 arrangement of peripheral doublets and central microtubules. A centriole has nine peripheral triplets connected to a proteinaceous hub by radial spokes.
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