Magnetosomes

Definition

Magnetosomes are intracellular structures in certain bacteria that contain magnetic iron minerals. They enable bacteria to orient themselves along the Earth's magnetic field.

5 Must Know Facts For Your Next Test

1. Magnetosomes are primarily found in magnetotactic bacteria.
2. They consist of magnetite (Fe3O4) or greigite (Fe3S4) crystals.
3. The formation of magnetosomes is genetically controlled within the bacteria.
4. Magnetosomes help bacteria locate optimal environments for survival by facilitating geomagnetic navigation.
5. They are enclosed within a lipid bilayer membrane.

Review Questions

• What are the primary components of magnetosomes?
• How do magnetotactic bacteria use magnetosomes to navigate?
• What type of genetic control is involved in the formation of magnetosomes?

Related terms

Magnetotactic Bacteria: Bacteria that orient and move along magnetic fields due to the presence of magnetosomes.

Magnetite: A type of iron oxide mineral, Fe3O4, commonly found in magnetosomes.

Lipid Bilayer:

A thin polar membrane made of two layers of lipid molecules; it encloses the contents of cells and organelles like magnetosomes.