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A rod shaped bacterium has a length of 2 μm, diameter of 1 μm and density the same as that of water. If proteins constitute 15% of the cell mass and the average protein has a mass of 50 kDa, the number of proteins in the cell is _________ (GATE-Biotechnology-2018)0 AnswerMass transfer coefficient for equimolar counter-diffusion of water vapour in air is 0.4 m s^-1(based on concentration difference). Mass diffusivity of water vapour in air is 3 ×10-4 m^2s^-1. For 100 µm diameter droplet, the Sherwood Number (NSh) is1 AnswerFill in the blanks. GATE-Biotechnology-20131 AnswerG enomic DNA isolated from a bacterium was digested with a restriction enzyme that recognizes a 6-base pair (bp) sequence. Assuming random distribution of bases, the average length (in bp) of the fragments generated is _________ (GATE-Biotechnology-2018)0 AnswerA sintered sample was weighed in air and water using an analytical balance. The mass of the sample in air is 2.67 g and its apparent mass in water is 1.67 g. The density of the sample is __________ g cm3 (give answer up to 2 decimal places)1 AnswerA single stem cell undergoes 10 asymmetric cell divisions. The number of stem cells at the end is _________ (GATE-Biotechnology-2018)2 AnswerCell type A secretes molecule X into the culture medium. Cell type B in the same culture responds to the molecule X by expressing protein Y. Which one of the following modes of signaling represents the interaction between A and B? (GATE-Biotechnology-2018)0 AnswerIf ν is the kinematic viscosity of air – water vapour mixture and DAR is the mass diffusivity of water vapour in air then the ratio ν/DAB is known as GATE-Agricultural Engineering-Question-20121 AnswerThe growth medium for mammalian cells contains serum. One of the major functions of serum is to stimulate cell growth and attachment. However, it must be filter sterilized to: (-Gate Biotechnology 2014 question paper)1 AnswerThe mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density - air, exhaust from chimney, honey, water, chalk, cotton, and iron. CBSE- Class9- Chemistry 20131 AnswerA cylindrical sandstone core, 7.5 cm long and 3.5 cm diameter has grain density of 3 g/cm3 . If the mass of the dry core is 200 g, the porosity of the core is __________%. (rounded-off to two decimal places) Gate-2018-General-Aptitude1 AnswerIn an exponentially growing batch culture of Saccharomyces cerevisiae, the cell density is 20 gl^-1 (DCW), the specific growth rate is 0.4^1 and substrate uptake rate (v) is 16 gl^-1h^-1. The cell yield coefficient Yx/s will be GATE-Biotechnology1 AnswerAn element with density 2.8 g cm –3 forms a f.c.c. unit cell with edge length 4 × 10 –8 cm. Calculate the molar mass of the element. CBSE- Class12- Chemistry 20141 AnswerF or a granitic rock mass, joint set number (Jn) = 9, joint water reduction factor (Jw) = 1, joint alteration number (Ja) = 1, stress reduction factor (SRF) = 1, rock quality designation (%) = 84 and joint roughness number (Jr) = 3. The Q-value as per Barton’s Q-system of rock mass classification (year 1974) is _______________.1 AnswerAmino acid residue which is most likely to be found in the interior of water-soluble globular proteins is: (-Gate Biotechnology 2014 question paper)1 AnswerI dentify the INCORRECT statement in connection with polar transport of auxin.1 AnswerA cantilever beam with length, L = 1 m, modulus of elasticity, E = 210 GPa, and area moment of inertia, I = 1.2 10m4 carries a concentrated mass m = 100 kg at its freeend. By idealizing it as a single degree-of-freedom system and neglecting the mass of the cantilever beam, the natural frequency (in rad/s) of small transverse oscillations of the mass m is …….. [up to two decimal places]0 AnswerA microbial strain is cultured in a 100 L stirred fermenter for secondary metabolite production. If the specific rate of oxygen uptake is 0.4 h^-1 and the oxygen solubility in the broth is 8 mg/L, then the volumetric mass transfer coefficient (KLa) (in s^-1) of oxygen required to achieve a maximum cell concentration of 12 g/L is (up to two decimal places) _________ (GATE-Biotechnology-2018)0 AnswerThe volume of a 500 g sealed packet is 350 cm3. Will the packet float or sink in water if the density of water is 1 g cm-3? What will be the mass of the water displaced by this packet? - Physics Cbse class 11 1 AnswerIn a shrinkage limit test, the volume and mass of a dry soil pat are found to be 50 cm^3 and 88 g, respectively. The specific gravity of the soil solids is 2.71 and the density of water is 1 g/cc. The shrinkage limit (in %, up to two decimal places) is _____ (GATE-CIVIL-Engg-2018)1 Answer