Answer Happy

part b only (PS: the answer is not 15 and 30)
Problem 11. (Gel electrophoresis) Gel electrophoresis separates charged organic molecules (usually DNA, RNA, or proteíns) by combing two forces: electric forces and drag forces. An applied electric field creates an electric force to try to push the molecules through a gel; the gel is extremely viscous, so there is a large viscous drag force that opposes the motion. The viscous drag force is proportional to the size of the molecules. Smaller molecules have a lower drag force, and thus a greater terminal velocity in the gel. This means that smaller molecules will move farther through the gel than large molecules will, in a given amount of time. A. Depending on the pH of the solution, the charge on a protein molecule can vary, but 30 excess electrons is typical. If the magnitude of the electric field is 1500 N/C, what is the magnitude of the electric force on the protein? Selected Answer: 0.0000000000000072 stion 25 B. A second protein has twice the size (specifically, twice the cross-sectional area) of the first protein. What is the minimum number of electrons the second protein can have, so that the process can differentiate the two proteins? (I.e. so that the second protein will travel farther through the gel than the first protein.)