Eubacteria organisms, also referred to as true bacteria, are organisms that are complex yet singled-celled. An example of bacteria in the Eubacteria kingdom are Streptococci, the bacterium responsible for strep throat. Some eubacteria produce food, such as yogurt, and help create vitamins. Other organisms in this kingdom include blue-green algae and actinobacteria.
Eubacteria can be classified by their shapes: spirilla, bacilli, and cocci. These bacteria are prokaryotic, meaning their cells do not have defined nuclei. Researchers at The University of California Santa Barbara call them the "true" bacteria. Some Eubacteria live in places with very little oxygen, and organisms in this kingdom reproduce asexually through binary fission. This can occur as often as once every 20 minutes, contributing to the rapid growth of illnesses, such as strep throat and E. coli. Eubacteria acquire nutrition through three different means: absorption, photosynthesis or chemosynthesis.
According to Rhode Island College, most bacteria are found in the Eubacteria kingdom, one of the six kingdoms of creatures found on Earth, and they are the ones with which people are the most familiar. The exact number of bacteria species is unknown, but some estimates place the number in the 10 million to one billion range.