Question

3. You observe the following while performing gel electrophoresis on two molecules at the same time and under the same conditions. Although the molecules are the same size, you observe that molecule A barely moves from the well while molecule B moves 2 cm towards the positive electrode. Give at least one explanation to explain why these two molecules of the same size behave differently in your experiment. Molecule A - Electrode Molecule B +Electrode wells

Answer 1

The principle is that an ion moves towards the oppositely charged electrode.

Here, both the ions are moving towards the same electrode, but A moves barely away from the well and B moves 2 cm towards the positive electrode. This means that the mlecule A is positively charged, whereas molecule B is negatively charged.