The pattern of microtubule organization of centrioles is
A
9 + 0
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B
9 + 1
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C
9 + 2
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D
9 + 3
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Solution
The correct option is A 9 + 0 The centrosomes and centrioles are found only in animal cells and help in cell division by forming the spindle fibres. The centrioles are made up of 9 peripheral fibrils (tubules). Central region is called a hub and is connected by spokes to the tubules. There are no tubules in the center, hence a 9 + 0 arrangement.