In a cilium or flagellum, _______microtubules are arranged _______.
a. 13; in a circle
b. 9 triplet; in a circle
c. 9 doublet; in a circle around a central pair of microtubules
d. 2 microtubules; perpendicular to each other
e. 2 microtubules; parallel to each other
Ans: c. 9 doublet; in a circle around a central pair of microtubules
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