A) The organised beating of cilia is controlled by fluxes of \[C{{a}^{2+}}\]across the membrane
B) Cilia are hair-like cellular appendages
C) Microtubules of cilia are composed of tubulin
D) Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules
Correct Answer: C
Solution :
Cilia are minute, iiairlike processes on the surface of protozoans or of metazoan cells which by their motion accomplish locomotion or produce a current. Each cilium contains a peripheral circle of nine doublet microtubules arranged around two single microtubules. Each microtubule is composed of tubulin proteins. Although the mechanism of ciliary movement is not completely understood- It is known that the microtubules behave as sliding filament that move past one another much like the sliding filaments of vertebrate skeletal muscle. The fluxes of \[C{{a}^{2+}}\]across the membrane is not responsible for controlling the organized beating of cilia.
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