Which Pair Is NOT Matched Correctly?
A) NtrC-Regulates Nitrogenase Gene $\sigma$

question 20

Multiple Choice

Which pair is NOT matched correctly?

• A) NtrC-regulates nitrogenase gene expression in response to NHconcentration
• B) NtrB-phosphorylates NtrC when NHconcentration is low
• C) NifL-forms a two-component signal transduction system with NtrC
• D) NifA-acts in concert with factor \(\sigma\)-54
• E) none of the above

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