Flagella

Flagella are whip-like structures found in various cells, including those of bacteria, archaea, and eukaryotes. They are involved in cell movement and are also used for sensory functions in some cells.

Structure of Flagella

Flagella are made up of a protein called flagellin. The structure of a flagellum consists of a basal body, hook, and filament. The basal body anchors the flagellum to the cell membrane and is responsible for its rotation. The hook connects the basal body to the filament, which is the long, helical structure that extends from the cell and propels the cell forward through a whipping motion.

Function of Flagella

The main function of flagella is to enable cell movement. In bacteria, the rotation of the flagella propels the cell through its environment, allowing it to move towards nutrients or away from harmful substances. In eukaryotic cells, such as those found in sperm cells, flagella are responsible for the movement of the cell itself.

Study Guide

1. What is the composition of flagella?
2. Describe the structure of a flagellum.
3. What is the main function of flagella?
4. Where are flagella found in cells?
5. How do flagella contribute to cell movement?

By studying the structure and function of flagella, you will gain a better understanding of cell biology and the mechanisms of cell movement.