Tag: GATE Life Science Previous Year Papers with Solutions

Q. 83 The growth profile of E. coli on glucose plus lactose is shown below. The specific growth rate of the second exponential phase is ____ 𝐡−𝟏. Diauxic growth in E. […]

Q. 82 If a bacterial cell contains 5,000 genes and if the average mutation frequency per gene is 𝟐 × 𝟏𝟎−𝟒 per generation, the average number of new mutations per […]

Q. 81 Nitrogenase reduces 𝐍𝟐 to 𝐍𝐇𝟑. Metal co-factors required for this activity are ____ . (A) Fe&Cu (B) Mo&Fe (C) Mo & Mn (D) Cu&Mn Nitrogenase, the enzyme responsible […]

Q. 80 E. coli requires three genes, galK (kinase), galT (transacetylase) and galE (epimerase) to utilize galactose. If there is a mutation in any one of these genes, the mutant […]

Q. 79 The decimal reduction time ( 𝐃𝟏𝟐𝟏 ) for Clostridium botulinum spores is 0.2 min . The time required to reduce the spore count from 𝟏𝟎𝟏𝟐 to one spore […]

Q.78 Which one of the following enzyme combinations allows some bacteria to utilize acetate through glyoxylate pathway? (P) Isocitrate lyase (Q) Isocitrate dehydrogenase (R) Succinyl CoA synthetase (S) Malate synthase […]

Q.77 At 𝐎𝐃𝟓𝟒𝟎 𝐧𝐦 = 𝟎. 𝟓, which one of the following bacterial mono-dispersed cell suspensions will have (i) maximum and (ii) minimum number of cells? (P) Mycoplasma pneumoniae (Q) […]

Q.76 Which of the following infectious agents cross the blood-brain barrier? (P) Streptococcus pneumoniae (Q) Coxsackie virus (R) Rotavirus (S) Streptococcus pyogenes (A) P & S (B) R & S […]

Q.75 E. coli ribonuclease contains 124 amino acids. The number of nucleotides present in the gene encoding the protein is ____ . E. coli ribonuclease with 124 amino acids requires […]

Q.74 The net yield of NADH in the Embden-Meyerhof pathway in E. coli is ____ . The Embden-Meyerhof pathway (EMP), or glycolysis, produces a net yield of 2 NADH molecules […]