Practice question

MCQ

Question

A locomotory structure is covered by the plasma membrane and contains nine peripheral microtubule doublets surrounding two central microtubules. What can be inferred?

Options

Choose one · Correct answer highlighted

It is a bacterial flagellum composed of a filament, hook and basal body. It is a centriole containing nine peripheral microtubule triplets. It is a eukaryotic cilium or flagellum containing a 9+2 axoneme. Correct It is a bacterial pilus involved primarily in attachment.

Explanation

A membrane-covered structure with a 9+2 axoneme is a eukaryotic cilium or flagellum. Bacterial flagella are structurally different, while centrioles possess nine peripheral triplets rather than a 9+2 arrangement.

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