Q. An organelle with an internal cross-section showing characteristic array is the

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Solution:

Cilia and flagella are long, motile, cylindrical projections of the cell membrane. The core of the cilia and flagella is called as axoneme. Axoneme of Both cilia and flagella, in a cross-section exhibit, a structure of , i.e., microtubules doublets on the periphery and central microtubules. In eukaryotes, it is composed of tubulin protein. Both cilium and flagellum are covered with a layer of plasma membrane.
Solution
Diagram showing axoneme of cilia and flagella
They arise from centriole like structures called basal bodies which, possess a number of microtubules running parallel to the long axis, in an arrangement of , i.e., nine triplets in the periphery without any microtubules in the centre, unlike the arrangement found in cilia and flagella.