Which one of the following is a rod-shaped bacterium?

Bacillus subtilis

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Pneumococcus pneumoniae

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Streptococcus nigricans

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Vibrio cholera

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Solution

The correct option is A Bacillus subtilis
Bacillus subtilis is a rod-shaped gram positive bacterium capable of forming endospores. The overall rod shaped of Bacillus subtilis is maintained during both vegetative growth and sporulation. Thus, spatial and temporal control of cell shape must be present during all phase of growth.
So, option A is the correct option.

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