Question

The prokaryotic flagella possess
a. Helically arranged protein molecule
b. 9+2 membrane enclosed structure
c. Unit membrane enclosed fibre
d. Protein membrane enclosed fibre

Answer 1

Hint: Flagellum is a whip-like structure, usually present in the unicellular organisms and helpful for their locomotion, microtubules in flagella propels, and helps the cell and organism to move in a cork-like motion.

Complete answer:
- The flagellum is the locomotory organ, usually present in both prokaryotes and eukaryotes.
- But the types of movements are different in both types of cells.
- The flagellum of prokaryotes generally consists of the body and the filament.
- The body of the flagellum is usually embedded into the cell.
- While the filament, it is also called a rod, it is hanging outside of the cell.
- In order to connect the body and the filament, a structure called a hook is present.
- The filament of the flagellum in prokaryotes, is usually empty or hollow from the tip of the flagellum to the base and makes the whole center of the flagellum hollow.
- In eukaryotes, flagella show the whip-like motion, and in the prokaryotes, it shows the cork-like entity, where there is no movement in flagella as there is a base in torque.
- The flagellum is made up of a protein called flagellin, and it is 20 nanometers, and it present as a hollow tube, and the proteins are arranged in a helical pattern, when this flagellum projects out at the area of the hook, it has a sharp bend.
- So from above explanation we can say that it is Helically arranged protein molecule

Hence, the correct answer is option (A).

Note: The movement of the flagellum is different in prokaryotes and eukaryotes, In prokaryotes, the flagella move in a circular motion to propel the bacteria forward, while in eukaryotes it shows whipping movement.