Eubacteria

Eubacteria

Eubacteria

Eubacteria Eubacteria are differentiated from archaea primarily based on chemical composition of cellular constituents. For example, bacterial cell walls are composed of peptidoglycan (though there are examples of bacteria that lack cell walls) while archaeal cell walls are composed of a protein.

Life Cycle Reproduction in bacteria involves duplicating the genetic material and dividing the cell into two daughter cells, a process known as binary fission (asexual). Under very favorable conditions, certain bacterial cells can divide as often as once every twenty minutes. Some bacteria, such as Clostridium and Bacillus species, possess the ability to form a resting state, or "spore," when unfavorable conditions are encountered. These spores are very resistant to heat, drying, radiation, and toxic chemicals. Bacterial spores have reportedly been reawakened from a 250-million-year-old salt crystal that existed before the time of the dinosaurs. Sterilization techniques used in medicine must overcome these resistant properties.

Size and Shape Prokaryotes range in size from 0.2 micrometers to more than 50 micrometers, although the average prokaryote is around 1 to 3 micrometers in size. Eukaryotic cells are approximately one order of magnitude larger, ranging in size from 5 to 20 micrometers in diameter, with an average size of 20 micrometers.

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Eubacteria

Eubacteria Examples

Salmonella E. Coli