All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #11 : Nucleic Acids
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?
Possible Answers:
Red section
It is impossible to tell without knowing the size of the DNA fragments
Green section
It is impossible to tell without knowing the charge of the DNA
Correct answer:
Green section
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.
Yongmao
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Nankai University, Bachelor of Science, Chemistry. Washington University in St Louis, Doctor of Philosophy, Organic Chemistry.
All GRE Subject Test: Chemistry Resources
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