![]() Tetrad: Bacterial cells remain in groups of four and divide in two planes.Strepto: Bacterial cells remain in chains after division.Diplo: Bacterial cells remain in pairs after division.There are five types of bacterial cell arrangement such as Variation also appears in the arrangement of bacterial cells.Some bacteria appear in unusual shapes such as star-shaped bacteria.Tightly coiled spiral-shaped bacteria is known as the spirochaetes.Bacterial cells appear in three shapes such as curved or spiral-shaped (spirilla), spherical or round shape (cocci), and rod shape (bacilli).The smallest bacteria is Mycoplasma genitalium which is approximately 200 to 300 nm in size.The largest bacteria is Thiomargarita namibiensis is up to half a millimetre long whereas the Epulopiscium fishelsoni is 0.7 mm.).Their size is one-tenth of eukaryotic cells and approximately 0.5–5.0 micrometres in length.They appear in various sizes and shapes.Classification of bacteria based on the Mode of Nutrition Type of Classification Examples Autotrophic Bacteria Cyanobacteria Heterotrophic Bacteria All disease-causing bacteria Classification of bacteria based on the Mode of Respiration Type of Classification Examples Anaerobic Bacteria Actinomyces Aerobic Bacteria Mycobacterium Bacteria Morphology Gram-negative bacteria, contain thin cell walls as compared to gram-positives.Gram-Positive bacteria, contain thick cell walls.Example: Leptospirosis, Lyme disease, and syphilis are caused by bacteria of this shape.įollow this article for more detail study: Size, Shape, and Arrangement of Bacterial Cells With Picture and Example Bacterial Cell can be classified based on their Cell Wall Nature Such as Spiral: These are curved or spiral shapes.Example: streptococcus group, responsible for “strep throat.” Coccus: These are spherical or round in shape.Classification of Bacteria Types Bacteria are classified into three groups based on their shape such as In the animal body, the largest number of bacterial cells can be found in the gut and skin.All bacterial species are not harmful some of them are beneficial, for example, they help in the synthesis of vitamin B12 and also play an important role in the fixation of nitrogen from the atmosphere.The biology where we study about bacteria is called bacteriology, which is a branch of microbiology.Bacteria can be found in both symbiotic and parasitic relationships with plants and animals. ![]() ![]() They can be found in soil, water, acidic hot springs, radioactive waste, and the deep biosphere of the earth’s crust.They have various shapes such as spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios), or corkscrew (spirochaetes).Bacteria belong to the prokaryotic domain.In 1828, Christian Gottfried Ehrenberg first introduced the term “bacterium”.In 1676, a Dutch microscopist Antonie van Leeuwenhoek first observed a bacterial cell by using a single-lens microscope of his own design.Bacteria are referred to as microscopic, single-celled organisms which exist in their millions, in every environment, both inside and outside other organisms.The total number of bacterial cells on earth is approximately 5×10^30. It is estimated that one gram of soil can contain approximately 40 million bacterial cells whereas one milliliter of fresh water can contain 1 million bacterial cells.
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