First slide

Metabolism of Nitrogen

Question

During biological fixation of 3 molecules of nitrogen, how many ATP and how many ammonia will be required and produced respectively?

Moderate

A

16 ATP and 2 ${NH}_{3}$
B

32ATP and 4 ${NH}_{3}$
C

48 ATP and 6 ${NH}_{3}$
D

48 ATP and 2 ${NH}_{3}$

Solution

For fixation of one molecule of nitrogen 16 ATP are utilized and in the process 2 ${NH}_{3}$ are produced. Therefore, for fixation of 3 molecules of nitrogen 16x3=48ATP will be required and 2x3=6 ${NH}_{3}$ will be produced.

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