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AfilCa [17]
3 years ago
15

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

Chemistry
1 answer:
SIZIF [17.4K]3 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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A sample of argon has a volume of 0.165L at -34.0°C and a 0.98atm of pressure. What would the volume of this gas at STP be?
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Answer: 0.185 L

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The combined gas equation is,

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

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P_2 = final pressure of gas = 1 atm  (at STP)

V_1 = initial volume of gas = 0.165 L

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T_1 = initial temperature of gas = -34.0^oC=273-34.0=239.0K

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Now put all the given values in the above equation, we get:

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Thus the volume of this gas at STP be 0.185 L

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