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Q.73 The primary product of nitrogen fixation is(A) N2 (B) NH4+ (C) NO2– (D) NO3 The primary product of nitrogen fixation is NH₄⁺ (ammonium ion).​ Option Analysis Nitrogen fixation converts […]

Q.72 Which of the following is NOT an accepted method for sterilization?(A) Autoclaving (B) X–rays(C) Gamma rays (D) UV rays UV Rays is not an accepted method for sterilization among […]

Q.71 Binomial nomenclature has NOT yet been adopted for(A) bacteria (B) fungi (C) viruses (D) protozoa The correct answer is (C) viruses. Binomial nomenclature, the two-word naming system (genus + […]

Q.70 Analysis of DNA sequences suggest that eukaryotic mitochondrial genomes primarilyoriginated from(A) fungi (B) protozoa (C) algae (D) bacteria Eukaryotic mitochondrial genomes originated primarily from bacteria, as confirmed by DNA […]

Q.69 Which of the following eukaryotic cellular components carries out intracellular degradationduring autophagy?(A) Nucleus (B) Golgi bodies (C) Ribosomes (D) Lysosomes Lysosomes carry out intracellular degradation during autophagy in eukaryotic […]

Q.68 The oral polio vaccine (OPV) consists of(A) live attenuated virus (B) killed virus(C) viral toxin (D) viral capsid subunit Oral Polio Vaccine (OPV) consists of live attenuated virus. This makes […]

Q.67 Which of the following immune system components can function as an opsonin?(A) Antibodies (B) T–cell receptors(C) Histamines (D) Interferons Antibodies are the immune system component that functions as an […]

Q.66 David Baltimore’s classification of viruses is based on differences in(A) host cell receptors used by viruses(B) the pathways required to synthesize virus mRNA(C) the modes of transmission of viruses(D) […]

Q.65 Two true–breeding snapdragon (Antirrhinum majus) plants, one with red flowers andanother with white flowers were crossed. The F1 plants were all with pink flowers. Whenthe F1 plants were selfed, […]

Q.64 In garden pea, dwarf plants with terminal flowers are recessive to tall plants with axialflowers. A true–breeding tall plant with axial flowers was crossed with a true–breedingdwarf plant with […]