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

Answer: (A)

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.