Coccus or cocci
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Spherically shaped bacteria are called coccus, or cocci (pl). An example would be Streptococcus.
An individual spherical bacterium is a coccus, and when you have a chain of them, it is referred to as streptococcus.
Spherical shape has minimum gravitational potential energy and everything in nature aspires for least potential energy i,e maximum stability.So all heavenly bodies are spherical in shape.
they "engulf" the bacteria
The outermost border in a bacteria cell is called membrane. This is also commonly referred to as the cell wall.