Classification of bacteria based on the shape and arrangement:
The stiff bacterial cell wall finds out the shape of a cell. Usual bacterial cells are spherical (i.e., Cocci), straight rods (i.e., Bacilli) or rods which are helically curved (i.e., spirilla), some bacterial cells are pleomorphic that is, they can show a diversity of shapes example: Arthrobacter
Cocci bacteria come out in numerous characteristic arrangements based on their plane of division.A. Diplococci:
Cells divide in one plane and stay joined in pairs.
Cells divide in one plane and stay joined to form chains.
Cells are classified in two planes and build group of four cells.
Cells are classified in three planes, in an irregular pattern, generating bunches of cocci.
Cells are divided into three planes, in a regular pattern, generating a cuboidal arrangement of cells.Bacilli forms take place singly or in pairs (i.e., diplobacilli) or form chains (i.e., streptobacilli). In Corynebacterium diphtheriae that is a bacillus species, the cells are arranged side by side similar to match sticks (i.e., palisade arrangement).
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