The prokaryotic flagella possess:
Correct answer: A. Helically arranged protein molecules
- A. Helically arranged protein molecules
- B. "9 + 2" membrane enclosed structure
- C. Unit membrane enclosed fibre
- D. Protein membrane enclosed fibre
Explanation
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 Å in diameter. The flagellin subunits are arranged in helical spirals and form a hollow cylinder. Each flagellum is about 120-150 Å thick.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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