Question

Which of the following statements regarding cilia is not correct?

• A. The organized beating of cilia is controlled by fluxes of Ca2+ 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

Answer 1

Answer: (A)

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

Answer 2

The organized beating of cilia is primarily controlled by the sliding movement of microtubules and the action of motor proteins (dynein arms), not by fluxes of Ca2+ across the membrane. Calcium ions may be involved in other cellular processes, but they do not directly control the beating of cilia.

So, the correct option is (A): The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane.