in which situation is nitrogenase expression up-regulated? choose one: a. low nh4 and low o2 conditions b. high nh4 and high o2 conditions c. low nh4 and high o2 conditions d. high nh4 and low o2 conditions



Answer :

Low NH₄ and high O₂ conditions are required for nitrogenase expression up-regulated.

What is nitrogenase expression regulated by?

control over the transcription of nitrogenase. The transcriptional control of nitrogen fixing is influenced by the oxygen and ammonium levels in the surrounding air. Because the nitrogenase components are oxygen labile, it is advantageous for bacteria to limit transcription when oxygen concentrations are high.

Reversible mono-ADP-ribosylation of the Fe protein, one of nitrogenase's components, regulates the enzyme's activity. The electrons necessary for the reduction of molecular nitrogen are supplied by this protein to the MoFe protein, the other component.

The enzyme nitrogenase turns nitrogen into ammonia. Some prokaryotes include it. Biological nitrogen fixation is the conversion of dinitrogen to ammonia by living things. The enzyme nitrogenase facilitates the transformation of nitrogen into ammonia.

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