Which of the following contain the 9 + 2 arrangement of microtubules, consisting of nine doublets of microtubules surrounding a pair of single microtubules?
A) both motile cilia and primary (nonmotile) cilia
B) centrioles only
C) both flagella and motile cilia
D) both basal bodies and primary (nonmotile) cilia
E) both centrioles and basal bodies

Question

Quizplus · Accepted Answer

Flagella and motile cilia contain the 9 + 2 arrangement of microtubules, consisting of nine doublets of microtubules surrounding a pair of single microtubules. Centrioles and basal bodies also have a similar 9 + 0 arrangement of microtubules, consisting of nine microtubule triplets, but not the 9 + 2 arrangement seen in flagella and motile cilia. Primary (nonmotile) cilia also have the 9 + 0 arrangement of microtubules seen in centrioles and basal bodies. Therefore, the only accurate answer is C.

Which of the Following Contain the 9 + 2 Arrangement