NEET 2006 Biology question

Which of the following statements regarding cilia is not correct -

(1)The organized beating of cilia is controlled by fluxes of Ca across the membraneCorrect
(2)Cilia are hair-like cellular appendages
(3)Microtubules of cilia are composed of tubulin
(4)Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules

Answer: (1)

Solution

Cilia are hair-like outgrowths of the cell membrane (2) whose core, the axoneme, is made of microtubules composed of the protein tubulin (3), arranged in the '9 + 2' pattern: an outer ring of nine doublet microtubules surrounding two central single microtubules (4). Statements (2), (3) and (4) are therefore correct.

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Question ID VK-089690