First slide

Metabolism of Nitrogen

Question

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

Easy

A

carotene
B

cytochrome
C

leghaemoglobin
D

xanthophyll

Solution

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by leghemoglobin.
The enzyme nitrogenase is highly sensitive to the molecular oxygen; it requires anaerobic conditions. The nodules have adaptations that ensure that the enzyme is protected from oxygen. To protect these enzymes, the nodule contains an oxygen scavenger called leg-haemoglobin.

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