Electrochemical Analyses
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GRE Subject Test: Chemistry › Electrochemical Analyses
Questions 1 - 1
1
Once a sample of DNA is isolated, it is loaded on an agarose electrophoresis gel, as shown below. Once the sample has run, where will the student find the DNA?
Green section
Red section
It is impossible to tell without knowing the size of the DNA fragments
It is impossible to tell without knowing the charge of the DNA
Explanation
DNA is negatively charged, so it will migrate toward the positive electrode during electrophoresis. As a result, it will migrate from the center line into the green region of the gel.