Gel Electrophoresis

How exactly do molecular biologists figure out all this stuff we have been learning? How do they do science with huge molecules like DNA and proteins? How can we gather empirical data about such molecules? Let's take a look at one absolutely indispensable technique called gel electrophoresis. This has many applications, but generally we use it to separate mixtures of biomolecules, often DNA, so that we can isolate particular strands for further analysis. How does this work? Let's find out!