What would be the number of protein molecules present in 1.0 mg of protein having a molecular weight of 25 kDa? (1) 2.4×1015 (2) 2.4×1016 (3) 2.4×1017 (4)2.4×1018 To calculate the number of protein molecules in 1.0 mg of protein with a molecular weight of 25 kDa, we can follow these steps: Given:
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
You have a freshly prepared 0.1 M solution of glucose in water. Each liter of this solution contains how many glucose molecules? (1) 6.02 * 10 ^ 23 (3) 6.02 * 10 ^ 24 (2) 3.01 * 10 ^ 23 (4) 6.02 * 10 ^ 22 Let’s break down the problem: Given: So, a 0.1 … Read more
Which of the following is not a colligative property. which arises in systems when there is addition of solute? (1) Lowering of vapour pressure (2) Lowering of melting point (3) Lowering of boiling point (4) Increase of osmotic pressure Colligative Properties: These properties depend only on the number of solute particles in a solution, not … Read more
Within the aqueous environment of an animal cell, sugars are stored as polymers rather than as monomers. If the sugars were stored as monomers instead of polymers, which of the following properties would be LEAST affected? (1) Freezing point (3) Viscosity (2) Osmotic pressure (4) pH et’s think about the properties of monomers versus polymers … Read more
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?(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? (1)7.0 (3)5.0 (2) 3.7 (4) 4.3
Tris hydroxyethyl aminoethane (THAE) has a pk, of 8.4. The buffering capacity of a buffer made with this compound will be greatest at which pH? (1) pH 9.4 ffer (2) pH 7.4 (3) pH 8.4 (4) Both at pH 7.4 and 9.4 Concept: Buffering Capacity and pKa The buffering capacity of a buffer is highest … Read more
What is the concentration of OH in a solution with a H’ concentration of 1.3 * 10 ^ – 4 M? (1) 7.7 * 10 ^ – 10 * M (2) 7.7 * 10 ^ – 9 * M (3) 7.7 * 10 ^ – 11 * M (4) 7.7 * 10 ^ – 12 … Read more