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Which of the following statements regarding cilia is not correct?

1. Cilia are hair-like cellular appendages
2. Microtubules of cilia are composed of tubulin
3. Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules
4. The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane

Correct answer: The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane

Solution

Cilia are hair-like structures built from tubulin-based microtubules arranged in a 9+2 pattern. Their beating is driven by dynein and ATP, while Ca2+ can modulate activity but is not the primary controller of organized beating.

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