Microtubules are hollow, cylindrical, non contractile membraneless, cytoskeletal structure of 250 Å diameter. These are composed of sulphur rich tubulin protein and arise from nucleating centres like kietochore, basal body, massules of centrioles etc. This tubulin occurs in

Microtubules are hollow, cylindrical, non contractile membrane less, cytoskeletal structure of 250 Å diameter. These are composed of sulphur rich tubulin protein and arise from nucleating centres like kinetochore, basal body, massules of centrioles etc. This tubulin occurs in

Select incorrect statement for bacterial flagella : Option 1 The filament is a hollow rigid cylindrical structure made of the protein called tubulin. Option 2 The filament measures about 20 nm in diameter and 1 −70 nm in length. Option 3 The basal body is the most complex part of the flagellum and consists of four rings connected to a central rod in Gram-negative bacteria. Option 4 Filament rotate by 360 ∘ rather thane undulating back and forth like a whip.