Question

A characteristic 9 + 2 arrangement of microtubules, consisting of nine doublets of microtubules surrounding a pair of single microtubules is associated with ________.

Answer 1

eukaryotic flagella and motile cilia

Answer 2

Motile cilia and flagella

Step-by-step explanation:

Both motile cilia and flagella consist of a central bundle of microtubule that is known as axoneme. The axoneme consists of nine doublets microtubules that surround a pair of the central single microtubules. This arrangement of microtubules in the cross secretion of flagella and motile cilia is called 9+2 arrangement.

Each of the 9 doublet microtubules consists of A and B tubules. Additional accessory proteins are associated with the 9+2 microtubules to make then stiff and elastic.