Question

Which of the following enzyme is not operational in Rhizobium during free living conditions ?

Aldolase
Nitrogenase
Enolase
Mutase

Answer 1

Nitrogenase is the enzyme that is inactive in Rhizobium in freeliving stage.

Explanation:

• Rhizobium is a nitrogen fixing symbiotic bacteria.

• Rhizobium can survive both in freeliving and symbiotic stage.

• But Rhizobium can fix nitrogen in only symbiotic stage.

• So all the other enzymes mentioned here, being the home keeping enzymes, needs to be functional to carry out normal day to day work.

• But Nitrogenase is the enzyme that is required for doing nitrogen fixation. So Nitrogenase will be inactivated during the freeliving stage.

• Rhizobium lives in a symbiotic relationship with the leguminous plants like pea plant inside the root nodules which is where they convert ammonia or nitrogen from air into nitrates.

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Answer 2

From the given option Nitrogenase is the enzyme that is not operational  in Rhizobium in free living stage.

Explanation:

• Nitrogenases are enzymes which are responsible for the reduction of nitrogen (N2) to ammonia (NH3).

• Rhizobium, is a rod shaped, aerobic, nitrogen fixing bacterium present in the root nodules of leguminous plants.

• It performs symbiotic nitrogen fixation in the root nodules of leguminous plants, in presence of an enzyme dinitrogenase.

So, the correct option is  Nitrogenase enzyme

For Further Reference:-

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