Question:

The prokaryotic flagella possess

Updated On: Jul 13, 2024
  • helically arranged protein molecule
  • 9 + 2' membrane enclosed structure
  • unit membrane enclosed fibre
  • protein membrane enclosed fibre.
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The Correct Option is A

Solution and 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 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.
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Concepts Used:

Prokaryotic Cells

Prokaryotic cells are single-celled microorganisms known to be the earliest on earth. Prokaryotes include Bacteria and Archaea. The photosynthetic prokaryotes include cyanobacteria that perform photosynthesis.

A prokaryotic cell contains a single membrane and therefore, all the reactions occur within the cytoplasm. They can be free-living or parasites.

Characteristics of Prokaryotic Cell:

Prokaryotic cells have different characteristic features such as:

  1. Lack of a nuclear membrane.
  2. Absence of Mitochondria, Golgi bodies, chloroplast, and lysosomes.
  3. Presence of genetic material on a single chromosome.
  4. Lack of histone proteins in the constituents of eukaryotic chromosomes.
  5. The cell wall is made up of carbohydrates and amino acids.
  6. The plasma membrane acts as the mitochondrial membrane carrying respiratory enzymes.