Question

) Primary cilia have a(n) ________ function and typically display a ________ structure.

A) axonal; 9+2
B) motile; 9+0
C) motile; 9+2
D) sensory; 9+0
E) filopodial; 9+4

Answer 1

Primary cilia are sensory and have a 9+0 structural arrangement, indicating the answer is D) sensory; 9+0.

Step-by-step explanation:

Primary cilia have a sensory function and typically display a 9+0 structure. Unlike their motile counterparts which display a "9 + 2 array" consisting of a ring of nine microtubule doublets with a central pair, primary cilia are involved in signal transduction rather than movement. Sensory cilia, which are typically found as one per cell, lack the central pair of microtubules, hence the 9+0 structure.