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  4. The usual axonemal arrangement of microtubules is

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Q. The usual axonemal arrangement of microtubules is

AMUAMU 2012Cell : The Unit of Life

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.