Discussion
Which one of the statements about bacterial flagella is correct?
Answer: D
The correct statement is that flagella originate from the basal body.
A bacterial flagellum has three parts: the basal body, a set of rings anchored in the cell envelope that acts as the rotary motor; the hook; and the long helical filament made of flagellin. The filament grows out from the basal body through the hook.
Flagella are long, typically 5 to 20 μm, far more than 0.5 to 2 μm. Each filament is a single helical structure, not a set of adjacent fibrils. Conjugation is mediated by sex pili, not flagella, which serve for motility.
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