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B
Fibre enclosed by unit membrane
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C
Helically arranged protein molecules
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D
Membrane enclosed 9 + 2 microtubule structure
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Solution
The correct option is C Helically arranged protein molecules Prokaryotic flagellum consists of 3 parts, namely filament, hook and basal body. The filament is composed of helically arranged protein molecules. This forms a hollow core. The protein present in flagellum is flagellin protein.
Thus, the correct answer is 'Helically arranged protein molecules.'