Q.The characteristic '9 + 2' arrangement of microtubules forming the axoneme is found in the internal structure of:

[!TLDR]

The axoneme of a cilium or flagellum shows the characteristic '9 + 2' microtubule arran …

The internal core of a cilium or flagellum, called the axoneme, is built from microtubules arranged in the characteristic "9 + 2" pattern: nine peripheral doublet microtubules arranged in a ring around two central singlet microtubules. Centrioles and basal bodies, though structurally related and built from microtubules, instead show a "9 + 0" arrangement (nine peripheral triplets, no central pair) -- so "9 + 2" specifically …

Distinguish the '9 + 2' axoneme pattern (cilia/flagella) from the related but different '9 …

Mixing up the '9 + 2' pattern of cilia/flagella with the '9 + 0' pattern of centrioles, since both structure …