Lactobacillus is the primary bacterium used in the fermentation process to produce yogurt.

Fungi, particularly the genus Penicillium, are used in the production of antibiotics like penicillin.

Rhizobium is a bacterium that forms symbiotic relationships with legumes and is used in biofertilizers for nitrogen fixation.

Bacteria are commonly used in the production of biofuels through fermentation processes.

Genetically modified bacteria are used in the production of insulin for diabetes treatment.

Lactobacillus is the primary bacterium used in the fermentation of milk to produce yogurt.