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Which is the main building block of cilia?

(a) Tubulin

(b) Nexin

(c) Dyenin

(d) Actin

I got this question at a job interview.

My question is based upon Two Fundamentally Different Classes of Cells in chapter Introduction to Cell of Cell Biology

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The correct option is (a) Tubulin

Easy explanation: Tubulin proteins are the main building blocks of cilia in prokaryotic organisms. Dyenin forms bridges between neighbouring microtubule doublets in structure of cilia. Nexin is present between microtubule doublets and prevent them to slide over one another.

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