Question

Your gel is shown above along with the positive and negative electrodes. Assume that this gel has been set up correctly. The previous question asked you to indicate the proper location of the wells of the gel. If you were to properly load DNA sample into these wells, in which direction would your samples travel during gel electrophoresis?

Question 2 options:

to the top of the gel


to the right side of the gel


up and out of the gel wells


to the left side of the gel


to the bottom of the gel

Answer 1

During gel electrophoresis, DNA samples will move towards the positive electrode because DNA is negatively charged (due to its phosphate backbone). If the negative electrode is at the top of the gel and the positive electrode at the bottom, then the samples will travel towards the bottom of the gel.

So, the correct answer is:

**to the bottom of the gel**