Question
Biology Question on Prokaryotic Cells
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
helically arranged protein molecule
Explanation
Solution
Prokaryotic flagellum is not surrounded by any membrane. It consists of a single thread. The thread is made of numerous identical spherical protein sub-units called, flagellin. Each subunit is about 40 A in diameter. The flagellin sub-units are arranged in helical spirals and form a hollow cylinder. Each flagellum is about 120-150 A thick.