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Answer for the clue "An enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia ", 11 letters:
nitrogenase

Word definitions for nitrogenase in dictionaries

WordNet Word definitions in WordNet
n. an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia

Wiktionary Word definitions in Wiktionary
n. (context enzyme English) Any enzyme, especially in nitrogen-fixing bacteria, that catalyzes the conversion of atmospheric nitrogen into ammonia.

Wikipedia Word definitions in Wikipedia
Nitrogenases are enzymes that are produced by certain bacteria , such as cyanobacteria (blue-green algae ). These enzymes are responsible for the reduction of nitrogen (N) to ammonia (NH). Nitrogenases are the only family of enzymes known to catalyze this ...