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Enzyme involved in nitrogen assimilation:

1. nitrogenase
2. nitrate reductase
3. transferase
4. transaminase

Correct answer: nitrate reductase

Solution

Nitrate reductase catalyzes the first step of nitrate assimilation by reducing nitrate to nitrite, making nitrogen available for further incorporation into biomolecules. Nitrogenase is for nitrogen fixation, not assimilation from nitrate.

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