Tag: GATE Life Science Previous Year Papers with Solutions

Q.77 Which one of the following is TRUE about siderophores in bacteria?(A) Siderophores are secreted only when soluble iron is available in the medium(B) Siderophores form complex with ferrous ions in […]

Q.76 In an experiment the structural genes lacZYAof lac operon were found to be constitutivelyexpressed. The following explanations were given for the constitutive expression(P) absence of a functional repressor due to […]

Q.75 Chemostat is a continuous culture system in which sterile medium is fed into the culture vessel at the same rate as the spent medium is removed. If in a […]

Q.74 The enzyme that catalyzes the reduction of nitrogen to ammonia is (A) Nitrogenase (B) Nitrate reductase (C) Nitrite reductase (D) Deaminase Nitrogenase is the enzyme that catalyzes the reduction […]

Q.73 If the radius of a spherical coccus is 0.8 μm, the value of surface area volume in μm−1 will be (A) 7.45 (B) 4.05 (C) 3.75 (D) 0.85 Introduction […]

Q.72 Which one of the following DO NOT use water as an electron source during photosynthesis?(A) Sulfate reducing bacteria(B) Methanogenic bacteria(C) Green and purple bacteria(D) Nitrifying bacteria Methanogenic bacteria do […]

Q.71 The theoretical maximum number of ATP molecules produced from aerobic oxidation of glucoseby eukaryotic cells is(A) 38 (B) 24 (C)12 (D) 8 The theoretical maximum ATP yield from complete aerobic […]

Q.70 The most common indicator organism of faecal pollution in water is(A) Clostridium botulinum (B) Bacillus subtilis (C) Escherichia coli (D) Clostridium tetani Escherichia coli (E. coli) serves as the standard […]

Q.69 Which one of the following transport mechanism is NOT employed by prokaryotes? (A) Passive diffusion (B) Group translocation (C) Endocytosis (D) Active transport Prokaryotes lack the cytoskeletal machinery and […]

Q.68 Shine Dalgarno’s sequence present in mRNA binds to (A) 3′ end of rRNA (B) 5′ end of rRNA (C) 5′ end of tRNA (D) 3′ end of tRNA Shine-Dalgarno […]