A) 6 pairs of doublets radially arranged at periphery with a pair of centrally located microtubules
B) 6 pairs of doublets radially arranged at periphery with a single centrally located microtubule
C) 9 pairs of doublets radially arranged at periphery with a pair of centrally located microtubules
D) 9 pairs of doublets radially arranged at periphery with a single centrally located microtubule
Correct Answer: C
Solution :
The core of cilium or flagellum is called axoneme which possesses a number of microtubules running parallel to the long axis. The axoneme usually has nine pairs of doublets of radially arranged peripheral microtubules and a pair of centrally located microtubules. Such an arrangement of axonemal microtubules is referred to as the 9 + 2 array.
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