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# Which of the following statements regarding cilia is not correct -

( A ) The organized beating of cilia is controlled by fluxes of $Ca^{2+}$ across the membrane
( B ) Cilin contain an outer ring of nine doublet microtubules surrounding two single microtubules
( C ) Cilia are hair-like cellular appendages
( D ) Microtubules of cilia are composed of tubulin