The flagella of bacteria are composed of:

Explanation

The flagella of bacteria are composed of flagellin, which is a protein. Flagellin is arranged in a helix, which forms the long, whip-like structure of the flagellum. The flagellum is attached to the cell membrane and the cell wall of the bacterium. Flagellin is a protein that makes up the structural components of flagella, the whip-like appendages that some microorganisms, including bacteria, use for motility (movement). Flagella allow these microorganisms to swim or move through their environment, and flagellin is an essential protein for their function.