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  Questions Related to microbiology & Bacteria - EduLesson Bacteria are classified into five groups according to their basic shapes: spherical ( cocci ), rod (bacilli), spiral ( spirilla ), comma (vibrios) or corkscrew (spirochaetes). They can exist as single cells, in pairs, chains or clusters. Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow. Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). They can exist as single cells, in pairs, chains or clusters. Bacterial growth  is proliferation of  bacterium  into two daughter cells, in a process called binary fission. Providing no event occurs, the resulting daughter cells are genetically identical to the original cell. Hence,  bacterial growth occurs. Both daughter cells from the division do not necessarily survive. There are three notable common traits ...