The free energy change () for nitrogen fixation is highly positive. Which of the following BEST explains how biological nitrogen fixation occurs despite this energetic barrier?
The reaction proceeds spontaneously at high temperatures found in root nodules
Nitrogenase acts as a catalyst, lowering the activation energy but not the
Hydrolysis of a large number of ATP molecules coupled to the reaction
The presence of leghemoglobin alters the thermodynamics, making negative
Related Questions
The enzyme nitrogenase is inhibited by:
Carbon dioxide
Oxygen
Nitrogen
Water
Separation of amino acid and carboxylic groups is called
Deamination
Exertion
Egestion
Transamination
Non-symbiotic nitrogen fixing prokaryote is
Azotobacter
Rhizobium
Cyanobacteria
Mycorrhiza
Which amino acid is the primary product formed when ammonia is assimilated into organic compounds?
Aspartate
Glutamate
Glycine
Alanine
Which of the following plant with nodule containing filamentous nitrogen – fixing micro – organism?
casuarina equisetifolia
crotalaria juncea
cycas revoluta
cicer arietinum
Select the match ones.I Nitrosomonas – Nitrite to nitrateII Thiobacillus - DenitrificationIII Nostoc - Free-living nitrogen-fixerIV Azotobacter - Anaerobic nitrogen-fixer
I and II
III and IV
II and III
II and IV
Which of the following statements is INCORRECT regarding the nitrogenase enzyme complex?
It requires ATP.
It is a metalloenzyme containing iron and molybdenum.
It is insensitive to oxygen.
It catalyzes the reduction of N2 to NH3.
If by radiation all nitrogenase enzymes are inactivated, then there will be no
Fixation of nitrogen in legumes
Fixation of atmospheric nitrogen
Conversion from nitrate to nitrite in legumes
Conversion from ammonium to nitrate in soil
Which of the following is a bacterium involved in denitrification?
Nitrococcus
Nitosomonas
Pseudomonas
Nitrobacter
Non-symbiotic nitrogen fixing prokaryote is
Rhizobium
Azotobacter
Anabaena
Frankia
