Multiple choice

Flagellar filament of bacteria grows by ________.

  1. assembly of subunits travelling through the hollow flagellum to the tip

  2. assembly of subunits along the length of the filament

  3. elongation from tip of the flagellum by enzymatic addition

  4. elongation from base of the flagellum by enzymatic addition
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A Correct answer
Explanation

Assembly of subunits travelling through the hollow flagellum to the tip. The flagella of bacterium are made up of protein called flagellin. Flagellum is hollow inside and the flagellin subunits are added through the flagellum to the tip. Flagellum of Bacillus subtilis had been completely sequenced and found to be made up of 304 amino acid residues which have a molecular weight of 32600.

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