During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by?
1. Leghaemoglobin
2. Xanthophylls
3. Carotene
4. Cytochrome
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following enzyme is not operational in Rhizobium during free-living conditions?
1. Aldolase
2. Nitrogenase
3. Enolase
4. Mutase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe function of leghaemoglobin in the root nodules of legumes is
(1) oxygen removal
(2) nodule differentiation
(3) expression of nif gene
(4) inhibition of nitrogenase activity
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe function of leghemoglobin in the root nodules of legumes is:
1. oxygen removal
2. nodule differentiation
3. expression of nif gene
4. inhibition of nitrogenase activity
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyReaction of N2 fixation process is depicted below
Select the correct set of A,B and C
1. A = , B=; C =
2. A = , B=; C =
3. A = , B=; C =
4. A = , B=; C =
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe reduction of one molecule of atmospheric nitrogen (N2) into two molecules of ammonia by nitrogenase enzyme requires
1. 4e–, 4H+, and 8ATP
2. 4e–, 4H+, and 16ATP
3. 8e–, 8H+, and 8ATP
4. 8e–, 8H+, and 16ATP
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor its action, nitrogenase requires:
1. Light
2. Mn2+
3. Super oxygen radicals
4. High input of energy
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRead the following statement & select the correct sequence of steps during symbiotic nitrogen fixation?
(a) interaction between Rhizobium & leguminous plant
(b) Root nodule formation
(c) Formation of ammonia
(d) leghaemoglobin
(e) Amino acid synthesis
1. a b c e d
2. b ad e c
3. a bc d e
4. a b d c e
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRoots of which plant contains a pink pigment that has an affinity for oxygen:
1. Carrot
2. Soyabean
3. Mustard
4. Radish
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLeghaemoglobin is produced in response to
1. respiration
2. photosynthesis
3. fatty acid synthesis
4. N2 fixation.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology