csir net life science lectures

Which of the following salt is the most commonly used reagent for salting out proteins because its high solubility (3.9M in water at 0 deg * C ) permits the achievement of solutions with high ionic strengths (up to 23.4 in water at 0 deg * C ?

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Which of the following salt is the most commonly used reagent for salting out proteins because its high solubility (3.9M in water at 0 deg * C ) permits the achievement of solutions with high ionic strengths (up to 23.4 in water at 0 deg * C ? (1) Ammonium sulfate ( (N*H_{4}) 2 SO … Read more

You are provided with 1.0M solutions of NaCl, (NH_{4}) 2 SO 4 , MgSO4 and K_{3}P*O_{4} In which of these solutions would a protein be expected to be lest soluble?

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You are provided with 1.0M solutions of NaCl, (NH_{4}) 2 SO 4 , MgSO4 and K_{3}P*O_{4} In which of these solutions would a protein be expected to be lest soluble? (1) NaCl (2) (N*H_{4}) 2 SO 4 (3) MgSO4 (4) K_{3}PO_{4} The solubility of a protein in a salt solution is influenced by the salting-out … Read more

Thallium-208 has a half-life of 3.053 min. How long will a sample containing 120.0 µCi of Thallium-208 take to decay to 7.50 µCi?

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Thallium-208 has a half-life of 3.053 min. How long will a sample containing 120.0 µCi of Thallium-208 take to decay to 7.50 µCi? (1) 6.11 min. (3) 12.21 min. (2) 9.36 min. (4) 18.46 min. Final Answer: The time required for Thallium-208 to decay to 7.50 µCi is 12.21 minutes. Thus, the correct answer is … Read more

In which of the following reactions, is the unit of rat constant and rate of reaction the same?

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In which of the following reactions, is the unit of rat constant and rate of reaction the same? (1) 1″ order reaction (2) 2nd order reaction (3) 3’d order reaction (4) Zero order reaction Answer: The unit of the rate constant and the rate of reaction will be the same for a zero-order reaction. This … Read more

Sucrose is a disaccharide with molecular weight of 342 Daltons, preparing 500 ml of 0.1M solution would require.

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Sucrose is a disaccharide with molecular weight of 342 Daltons, preparing 500 ml of 0.1M solution would require. (1) 17.1 gm of sucrose (2) 0.171 gm of sucrose (3) 1.71 gm of sucrose (41)171 gm of sucrose

The total number of cells in the body of an individual is 6 x 1015. If he is administered with 5.8 mg of insulin (MW:5808 Da), how many molecules will be there in each cell (presume that the drug penetrates all cells in, the body with equal efficiency)?

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The total number of cells in the body of an individual is 6 x 1015. If he is administered with 5.8 mg of insulin (MW:5808 Da), how many molecules will be there in each cell (presume that the drug penetrates all cells in, the body with equal efficiency)? (1) 100 (2) 10 (3) 1000 (4) … Read more

While making 100 ml of 2M NaCl solution, a student left the solution on a heating platform reducing the volume by 50 ml. This solution was diluted 1:100 for use. What is the final concentration of NaCl in this solution?

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While making 100 ml of 2M NaCl solution, a student left the solution on a heating platform reducing the volume by 50 ml. This solution was diluted 1:100 for use. What is the final concentration of NaCl in this solution? (1) 20 mm , (2) 80 mm (3)40 mM . (4) 400 mM

Osmotic pressure does not depend on

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Osmotic pressure does not depend on (1) Temperature (3) Molecular weight (2) Degree of ionization (4) Molar concentration Osmotic Pressure: Osmotic pressure is the pressure required to stop the flow of solvent through a semi-permeable membrane separating two solutions of different concentrations. It depends on the concentration of solute particles in the solution. Formula for … Read more

Which of the following will have maximum effect on lowering in vapour pressure if added in equimolar concentration?

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Which of the following will have maximum effect on lowering in vapour pressure if added in equimolar concentration?(1) Sucrose(3) NaCl(2) Glucose(4) CaCl₂ What is Vapor Pressure Lowering? When you add a solute (like sugar or salt) to a solvent (like water), it lowers the vapor pressure of the solvent. This is called lowering of vapor … Read more

If you mix equal volumes of pH 4.0 and pH 6.0 solutions, what will be the approximate pH of the final solution?

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If you mix equal volumes of pH 4.0 and pH 6.0 solutions, what will be the approximate pH of the final solution? (1)7.0 (3)5.0 (2) 3.7 (4) 4.3