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GATE 2018 : Life Sciences [Section S / Microbiology] (with Final Answer Keys)

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GATE 2018 XL (S): Q.1 Microbiology (XL-S) Q. 1 Q. 10 carry one mark each & Q. 11 Q. 20 carry two marks each. 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) the envelope proteins on the surface of viruses Q.2 Which of the following immune system components can function as an opsonin? (A) Antibodies (C) Histamines Q.3 (B) T-cell receptors (D) Interferons The oral polio vaccine (OPV) consists of (A) live attenuated virus (C) viral toxin Q.4 Which of the following eukaryotic cellular components carries out intracellular degradation during autophagy? (A) Nucleus Q.5 (B) protozoa (B) fungi (C) algae (D) bacteria (C) viruses (D) protozoa (B) X-rays (D) UV rays The primary product of nitrogen fixation is (A) N2 Q.9 (D) Lysosomes Which of the following is NOT an accepted method for sterilization? (A) Autoclaving (C) Gamma rays Q.8 (C) Ribosomes Binomial nomenclature has NOT yet been adopted for (A) bacteria Q.7 (B) Golgi bodies Analysis of DNA sequences suggest that eukaryotic mitochondrial genomes primarily originated from (A) fungi Q.6 (B) killed virus (D) viral capsid subunit (B) NH4+ (C) NO2 (D) NO3 In humans, the key stages in the life cycle of malarial parasites occur in (A) red blood cells and the liver (B) red blood cells and platelets (C) red blood cells and the pancreas (D) red blood cells and the gut XL-S 1/3

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