Answer: Frictional Force
Explanation: Friction always acts to oppose any relative motion between surfaces. For the simple example of a book resting on a flat table, the frictional force is zero.
Answer:
Electrophoresis is a laboratory technique used to separate DNA, RNA, or protein molecules based on their size and electrical charge. An electric current is used to move molecules to be separated through a gel. ... The conditions used during electrophoresis can be adjusted to separate molecules in a desired size range.