Category: GATE Biotechnology Previous Year Papers with Solutions

Q.25 Which of the following essential element(s) is/are required as major supplement to enhance the bioremediation of oil spills by the resident bacteria? (A) Sulfur (B) Nitrogen and phosphorus (C) […]

Q.24 A bacterium belonging to cocci group has a diameter of 2 µm. The numerical value of the ratio of its surface area to volume (in µm−1) is ________ Bacterium […]

Q.23 Gram-positive bacteria are generally resistant to complement-mediated lysis because (A) thick peptidoglycan layer prevents insertion of membrane attack complex into the inner membrane (B) Gram-positive bacteria import the membrane […]

Q.22 The degree of reduction of ethanol is _______ ✅ Crrect Answer: 6 The degree of reduction of ethanol (C₂H₅OH or C₂H₆O) is 6 per carbon atom using standard valence […]

Q.21 Since mammalian cells are sensitive to shear, scale-up of a mammalian cell process must consider, among other parameters, the following (given N = rotations/time, D = diameter of impeller): […]

Q.20 Which of the following is employed for the repeated use of enzymes in bioprocesses? (A) polymerization (B) immobilization (C) ligation (D) isomerization Immobilization enables repeated enzyme use in bioprocesses […]

Q.19 The most plausible explanation for a sudden increase of the respiratory quotient (RQ) of a microbial culture is that (A) cells are dying (B) yield of biomass is increasing […]

Q.18 In a batch culture of Penicillium chrysogenum, the maximum penicillin synthesis occurs during the (A) lag phase (B) exponential phase (C) stationary phase (D) death phase Penicillin synthesis by […]

Q.17 If the dissociation constant for solute-adsorbent binding is Kp, the retention time of the solute in a chromatography column (A) increases with increasing KD (B) decreases with increasing KD […]

Q.16 The unit for specific substrate consumption rate in a growing culture is (A) g / L·h (B) g / h (C) g / g·h (D) gmol / L·h Unit […]