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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 […]

Q. 73 The precursor for the synthesis of aromatic amino acids is (A) phosphoenolpyruvate (B) pyruvate (C) oxaloacetate (D) 𝛼-ketoglutarate The precursor for the synthesis of aromatic amino acids—phenylalanine, tyrosine, […]

Q. 72 Biofilm produced by bacteria is detected by (A) Saffranin (B) Malachite green (C) Basic fuchsin (D) Congo red Biofilms are slimy, protective communities formed by bacteria that stick […]