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Leg Hemoglobin

During biolog...

Question

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

A

Cytochrome

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B

Leghaemoglobin

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C

Xanthophyll

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D

Carotene

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Solution

The correct option is B
Leghaemoglobin

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

It is a red pigment that has the ability to combine very rapidly with oxygen and thus act as a very efficient oxygen scavenger.

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Q. During biological nitrogen fixation by bacteria which one of the following elements produces toxic effect?

Q. Nitrogen fixation is inhibited by oxygen. However, in aerobic nitrogen-fixing bacteria, nitrogen is fixed in the presence of oxygen. Nitrogenase in such organisms is protected by which one of the following mechanisms.

Q. Which among these elements is required for the action of enzyme nitrogenase an enzyme needed for biological nitrogen fixation?

Q. Assertion (A): Nitrogenase enzyme gets inactivated in the presence of oxygen, yet nitrogen fixation occurs in aerobic cells of legume nodules
Reason (R): Leghaemoglobin allows presence of oxygen just sufficient for cellular respiration only

Q. Assertion :Nitrogenase enzyme gets inactivated in presence of oxygen yet

N_{2}

fixation occurs In aerobic cells of legume nodules. Reason: Leghaemoglobin allows presence of oxygen just sufficient for cellular respiration only.

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