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Q.71 A bacterium obtains energy from a chemical source by the oxidation of reduced𝑁𝑂2–, with 𝐶𝑂2 as the principal carbon source. Which one of the followingnutritional groups does this bacterium […]

Q.70 A penicillin sensitive Escherichia coli population is exposed to a lethal dose(200 μg/ml) of penicillin. Assuming density–independent mortality, whichone of the following relationships would describe the number of survivingbacteria […]

Q.69 Robert Koch used a meat–infused nutrient medium for which one of thefollowing purposes?(A) To grow disease causing microorganisms.(B) To demonstrate presence of microorganisms in air.(C) To test the efficiency […]

Q.68 Correctly match the bacterial type in Column I with their corresponding environmental niche in Column II. Column I Column II P. Psychrophile i. Pressure greater than 380 atm Q. […]

Q.67 India is aiming to be free of tuberculosis by 2025. One of the key approachesfor this program is DOTS. Which one of the following options is the full formof […]

Q.66 Which one of the following metabolites is associated with bacterial stringentresponse?(A) Cyclic di–GMP (CDG)(B) Guanosine tetraphosphate (ppGpp)(C) Cyclic–AMP (cAMP)(D) Cyclic–GMP (cGMP) The metabolite associated with the bacterial stringent response […]

Q.65 In a genetic cross between a true–breeding tall parent bearing red flowers and atrue–breeding dwarf parent bearing white flowers, only tall plants with redflowers are obtained in the F1 […]

Q.64 Which of the following reactions in plants is/are catalyzed by the malic enzymes?(A) Malate + NAD+ → Pyruvate + CO2 + NADH(B) Malate + NAD+ ⇌ Oxaloacetate + NADH(C) […]

Q.63 If rabbits are introduced in an isolated grassland for the first time, whichof the following growth curves (shown using dashed line) is/are theoreticallypossible population dynamics over time? (A) P(B) […]

Q.62 Which of the following sequential reactions correctly represent(s) the flow ofelectrons from NADH to O2 in plant mitochondrial electron transport chain?(A) NADH dehydrogenase → Ubiquinone → Succinate dehydrogenase →Cytochrome […]