The core of a centriole exhibits which structural arrangement of microtubules?
Answer and explanation
Correct answer: D. triplet arrangement without central microtubules
- Step 1: Centrioles are cylindrical structures that occur in pairs within the centrosome of animal cells.
- Step 2: Cross-sections reveal a cartwheel organization composed of nine peripheral triplets of microtubules tilted like turbine blades.
- Step 3: Unlike the flagellar axoneme, the center contains a protein hub rather than microtubules, yielding a classic pattern.
Answer
triplet arrangement without central microtubules.
Why not the others: doublet arrangement is the architecture of motile cilia and flagella; doublet arrangement does not occur naturally in basal structures; arrangement is anatomically nonexistent.
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