What is the structural organization of microtubules in the eukaryotic cilia and flagella axoneme?
Answer and explanation
Correct answer: A. doublet arrangement
- Step 1: The core of eukaryotic cilia and flagella is called the axoneme.
- Step 2: Transmission electron microscopy demonstrates an axoneme consisting of nine peripheral doublets of microtubules.
- Step 3: In addition to the nine peripheral doublets, there is a central pair of single microtubules linked by bridges, establishing the classic pattern.
Answer
doublet arrangement.
Why not the others: triplet arrangement is the cartwheel structure of centrioles and basal bodies; singlet arrangement miscounts peripheral doublets; triplet arrangement does not exist in eukaryotic cytoskeletal elements.
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