Respiration in bacteria
Category : 11th Class
With respect to oxygen requirement and mode of cellular respiration, bacteria distinctly belong to two broad categories :
(1) Aerobic respiration
Obligate aerobes : These bacteria grow exclusively in presence of molecular oxygen and fail to survive in its absence, e.g., Bacillus subtilis, Azotobactor, Arthrobactor, Mycobacterium etc.
Facultative anaerobes : The aerobic bacteria which can also survive in absence of oxygen, e.g., Aerobacter, Klebsiella, Pseudomonas, etc.
(2) Anaerobic respiration
Obligate anaerobes : These bacteria grow and multiply in the absence of free oxygen. They fail to survive under aerobic conditions, e.g., Clostridium botulinum.
Facultative aerobes : The anaerobic bacteria which can also survive in presence of oxygen, e.g., Chlorobium limicola.
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