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.). ![]()
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