![]() The first way, which is particularly relevant in medicine, is related to the outer covering of the cell. Some types also have a third outer layer called a capsule.īacteria can be separated into categories based on various different features. Gram positive bacteria are surrounded by a single thick peptidoglycan cell wall and are therefore termed monoderms. Each cell is generally contained within a cell membrane, which itself is contained within a protective cell wall. Responsible for abscesses, dermatitis, localized infections and possible gastroenteritis. This means that their genetic material is ‘loose’ within each cell. Although, the colonies they form are visible.īacteria are prokaryotic, which means that they exist as single cells, although they form groups known as colonies. Most individual bacterial cells – an individual ‘bacterium’ – are too small to be seen with the human eye. Various sources suggest there may be as many as one trillion species – although the vast majority of these have not yet been discovered. They are one of the first life forms to exist on Earth and have been around for approximately three billion years. ![]()
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