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Question

How many radial spokes are there in a flagellum?

A
9
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B
10
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C
2
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D
9+2
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Solution

The correct option is A 9
In a falgellum, the microtubules are arranged in 9+2 array in which nine pairs of doublets are radially arranged at the periphery and a pair are located centrally. The central tubules are connected by bridges and is also enclosed by a central sheath. One of the tubules of each peripheral doublets is connected to central sheath by a radial spoke. Thus, there are nine radial spokes.

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