Which cell structure is shown in the given figure?

What is $Q$ in the given structure of a cilium/flagellum?

Statement $X$ : Basal bodies are involved in the formation of cilia and flagella.
Statement $Y$ : Nucleoli contain the nucleus and chromatin material.

Nerve cells do not divide because they do not have

The centrosome is involved in:

The arrangement of $..............$ is like a cartwheel.