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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).

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. Biologists estimated that the first forms of life appeared on Earth about 4 billion years ago, which was a unicellular microorganism, the modern name is bacteria. They are considered as the first life forms to appear on Earth. What is bacteria? Bacteria is an essential part of the environment.