A 9 + 2 arrangement of microtubules,consisting of nine doublets of microtubules surrounding a pair of single microtubules,is associated with which of the following structures?
A)motile cilia and centrioles
B)centrioles only
C)both eukaryotic and bacterial flagella
D)eukaryotic flagella only
E)eukaryotic flagella and motile cilia

Question

Quizplus · Accepted Answer

The 9 + 2 arrangement of microtubules is associated with both eukaryotic flagella and motile cilia. These structures share the same basic structure and are both involved in movement, making them the best choice for this arrangement. Centrioles are also composed of microtubules, but they do not have the 9 + 2 arrangement and therefore are not the best choice. Bacterial flagella have a different structure altogether, so they are not associated with the 9 + 2 arrangement.

A 9 + 2 Arrangement of Microtubules,consisting of Nine Doublets