NEET Biology question

Which of the following options is correct about structures visible in the cross-section of a centriole?

(A)Peripheral microtubules (triplets) = 9, Central microtubules (singlets) = 2, Hub = 2, Spokes = 9, Inner triplet bridge = 9
(B)Peripheral microtubules (triplets) = 9, Central microtubules (singlets) = 1, Hub = 9, Spokes = 2, Inner triplet bridge = 9
(C)Peripheral microtubules (triplets) = 9, Central microtubules (singlets) = 2, Hub = 0, Spokes = 1, Inner triplet bridge = 9
(D)Peripheral microtubules (triplets) = 9, Central microtubules (singlets) = 0, Hub = 1, Spokes = 9, Inner triplet bridge = 9Correct

Answer: (D)

Solution

A centriole's cross-section shows 9 peripheral triplet microtubules arranged around a central hub (with no central pair/singlets, i.e.,

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Question ID VK-112125