Peroxisomes are small, membrane-bound organelles found in the cytoplasm of eukaryotic cells. Their main function is to carry out oxidative reactions that break down fatty acids, amino acids, and other molecules. This process generates hydrogen peroxide (H2O2), which is a toxic byproduct.

Here's a breakdown of their key functions:

* β-oxidation of fatty acids: This is the breakdown of fatty acids to produce acetyl-CoA, which can then be used for energy production in the mitochondria.

* Detoxification: Peroxisomes detoxify harmful substances like alcohol, formaldehyde, and hydrogen peroxide. They contain enzymes that break down these compounds into less harmful products.

* Synthesis of lipids and bile acids: Peroxisomes play a role in the synthesis of certain lipids, including plasmalogens (important for myelin sheath formation) and bile acids (essential for digestion).

* Catabolism of purines: They break down purines, which are components of nucleic acids, into uric acid.

Overall, peroxisomes are crucial for a wide range of cellular functions, including energy production, detoxification, lipid metabolism, and the breakdown of specific molecules.