Most widely used bacterium in plant genetic engineering, in relation to nitrogen fixation, is Klebsiella pneumoniae which can fix nitrogen under ................. conditions.
A
Aerobic
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B
Anaerobic
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C
Laboratory
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D
All of the above
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Solution
The correct option is A Anaerobic Klebsiella pneumoniae is a Gram-negative, non-motile, encapsulated, lactose-fermenting, facultative anaerobic, rod-shaped bacterium. It naturally occurs in the soil, and about 30% of strains can fix nitrogen in anaerobic conditions.