Bacteria residing in the root nodules of the pea plant...

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Key Concepts

Energy Demands of Nitrogenase

The enzyme complex nitrogenase, which catalyzes the reduction of nitrogen to ammonia, requires a significant amount of ATP to overcome the strong triple bond in the N2 molecule. This high energy requirement is why a substantial portion of the plant's ATP is diverted to support the bacterial process.

Mutualistic Symbiosis

In the symbiotic relationship between leguminous plants and nitrogen-fixing bacteria, the plant provides carbohydrates and energy (in the form of ATP) to the bacteria, while the bacteria supply the plant with a usable form of nitrogen. This mutual benefit underlies the high energy investment by the plant in supporting the bacteria.

Biological Nitrogen Fixation

This is the process by which certain bacteria convert atmospheric nitrogen (N2) into ammonia, a form of nitrogen that plants can use. It is essential for plant growth, as atmospheric nitrogen is chemically inert and unavailable to most organisms, making its conversion crucial for the nitrogen cycle.

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