Select the two correct statements out of the four(a-d) give below about lac operon. (i) Glucose or galactose may bind with the repressor and inactive it (ii) In the absence of lactose the represor binds […]
Haploids are more suitable for mutation studies than the diploids. This is because
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(a) haploids are reproductively more stable than diploids (b) mutagens penetrate in haploids more effectively than diploids (c) haploid […]
Read the following four statements (A-D).
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(a) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane (b) In dicot stems, a new cambium originates from cellls of pericycle […]
Which one of the following is correctly matched about plant nutrients?
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(a) Passive transport of nutrients – ATP (b) Asoplast – Plasmodesmata (c) Potassium – Readily immobilisation (d) Bakane of rice seedlings […]
Which one of the following is wrong statement about nitrogen fixing?
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(a) Anabaena and Nostoc are capable of fixing nitrogen in free living state also. (b) Root nodule forming nitrogen fixers live […]
Which two distinct mictobial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N) to the atmosphere?
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(a) Anaerobic ammonium oxidation, and denitrification (b) Aerobic nitrate oxidation, and nitrite […]
The domestic sewage in large cities
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(a) has a high BOD as it contains both aerobic and anaerobic bacteria. (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment […]
Trichoderma harzianum has proved a useful microorganism for
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(a) bioremediation of contaminated soils (b) reclamation of wastelands (c) gene transfer in higher plants (d) biological control of soil-borne plant pathogens
Correct Answer: […]
During sewage treatment, biogases are produced which include :
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(a) methane, oxygen, hydrogen sulphide (b) hydrogen sulphide, methane, sulphur dioxide (c) hydrogen sulphide, nitrogen, methane (d) methane, hydrogen sulphide, carbon dioxide
Correct […]
Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct ?
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(a) Yeast – statins (b) Acetobacter aceti – acid […]
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