Question

The 9 + 2 organisation of microtubules is present in
(1) Cilia of eukaryotes
(2) Flagella of prokaryotes
(3) Centrioles
(4) Basal body of eukaryotic fiagella​

Answer 1

Answer:

Basal body of eukaryotic flagella​

The $9 + 2$ organization of microtubules is present in Basal body of eukaryotic flagella​.

Explanation:

The motile cilium is a complex organelle with a 9+2 microtubule skeleton, which consists of nine doublet microtubules surrounding a pair of central singlet microtubules. The central microtubules, like the doublet microtubules, serve as a scaffold for the assembly of protein complexes, resulting in an intricate network of interconnected projections. The central microtubules and associated structures are referred to collectively as the central apparatus (CA). A number of highly conserved protein complexes, unprecedented high-resolution views of projection structure, and new insights into the regulation of dynein-driven microtubule sliding have been discovered through studies using a variety of experimental approaches and model organisms.

The central apparatus (CA) is made up of these central microtubules and their associated protein projections. Despite a few exceptions to the $9+2$ microtubule arrangement, the CA is remarkably well conserved across eukaryotes and is thought to have been present in cilia of the last common eukaryotic ancestor.