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AfilCa [17]
4 years ago
15

Control over nitrogenase activity is accomplished by which of the following?

Chemistry
1 answer:
SIZIF [17.4K]4 years ago
5 0

Answer:

C

Explanation:

Control over nitrogenase activity is accomplished by  NH4+ prevents expression of the genes that encode nitrogenas.

Nitrogenase synthesis in free-living N2-fixing bacteria is universally under repressor control by ammonia. This, however, is not

the case for rhizobia. A need for N2 as inducer apparently does not

exist.  The degree of ammonia repression is unusual in its strength.

Nitrogenase activity is at least 1O,OOO-fold lower in extracts of

NH4+-grown cells versus N2-grown cells.

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