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  •  Choose the incorrect optionOption: 1 Pili and fimbriae are bacterial appendages that are not involved in locomotion.

 Choose the incorrect option

Option: 1

Pili and fimbriae are bacterial appendages that are not involved in locomotion.
 


Option: 2

Pili are long, thick, tubular outgrowths.
 


Option: 3

PIli help in attachment of donor cell to the recipient cell during conjugation 
 


Option: 4

Pili consist of a protein called flagellin 
 


Answers (1)

best_answer

Extracellular structures in Bacteria -

Extracellular structures in bacteria are pili, fimbriae and flagella
Pili and Fimbriae

  • Pili and fimbriae are bacterial appendages that are not involved in locomotion.
  • Pili are long, thick, tubular outgrowths that help in attachment of donor cell to a recipient cell and form conjugation tube.
  • Pili consist of a protein called pillin.
  • Fimbriae are short and narrower outgrowth that take part in adhesion of bacteria to solid surfaces.

 Flagellum

  • An organ of motility in bacteria.
  • Arise from basal granule called blepharoplast.
  • Flagella have 3 parts i.e. basal body, hook and filament.
  • The basal body is a rod-like structure having ring-like swellings and embedded in the cell envelope. There are two pairs of rings L and P (in the cell wall)  and S and M (in Cell membrane).
  • The hook is curved structure attaching the basal body to the filament.
  • The filament is a long tubular structure composed of the protein flagellin.
  • Bacterial flagella perform rotation type movement that brings backwards pushing of the water.


-Pili is made up of pilin protein.
 

Posted by

seema garhwal

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