Question 71. A bacterial culture (200 l containing 1.8 * 109 cells) was treated with an antibiotic Z (50 μg per ml) for 4 h at 37ËšC. After this treatment, the culture was divided into two equal aliquots. Set A: 100 μl was plated on Luria agar. Set B: 100 μl was centrifuged, the cell pellet washed and plated on Luria agar. After incubating these two plates for 24 h at 37ËšC, Set A plate showed no colonies, whereas the
Set B plate showed 0.9 * 109 cells. This experiment showed that the antibiotic Z is

Question 72. In a muscle, the extracellular and intracellular concentrations of Na+ are 150 mM and 12 mM, and those of
K+ are 2.7 mM and 140 mM, respectively. Assume that the temperature is 25oC and that the membrane
potential is -60 mV, with the interior more negatively charged than the exterior. (R = 8.314 J mol-1 K-1;
F = 96.45 kJ mol-1 V-1) The free energy change for the transport of two K+ into the cell is

Question 73. In a muscle, the extracellular and intracellular concentrations of Na+ are 150 mM and 12 mM, and those of
K+ are 2.7 mM and 140 mM, respectively. Assume that the temperature is 25oC and that the membrane
potential is -60 mV, with the interior more negatively charged than the exterior. (R = 8.314 J mol-1 K-1;
F = 96.45 kJ mol-1 V-1) The free energy change for the transport of three Na+ out of the cell is

Question 74. An automobile plant contracted to buy shock absorbers from two suppliers X and Y. X supplies
60% and Y supplies 40% of the shock absorbers. All shock absorbers are subjected to a quality test.
The ones that pass the quality test are considered reliable. Of X's shock absorbers, 96% are reliable.
Of Y's shock absorbers, 72% are reliable. The probability that a randomly chosen shock absorber, which is found to be reliable, is made by Y
is

Question 75. A political party orders an arch for the entrance to the ground in which the annual convention is
being held. The profile of the arch follows the equation y = 2x “ 0.1x2 where y is the height of the
arch in meters. The maximum possible height of the arch is

Question 76. Synteny refers to

Question 77. The molarity of water in a water : ethanol mixture (15 : 85, v/v) is approximately

Question 78. While searching a database for similar sequences, E value does NOT depend on the

Question 79. In transmission electron microscopy, electron opacity is greatly enhanced by treating the specimen
with

Question 80. The helix content of a protein can be determined using