Part III: Agarose Gel Electrophoresis How does agarose gel electrophoresis work? That is, what causes DNA fragments of different sizes to become separated? Briefly, what is agarose? Why did we add gel loading buffer to the PCR products before the gel electrophoretic separation? What is the purpose of the 200 bp DNA ladder we ran with our samples? How did we visualize the separated DNA fragments?
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Agarose, a polysaccharide derived from seaweed, forms a gel matrix through which the DNA fragments can move. ** Show more…
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1- Describe the action of Agarose Gel Electrophoresis (how does the DNA run through the gel? 2- What are the three components necessary for making a viewable agarose gel?
Nehal A.
1. What is agarose? 2. What is the function of buffers in gel electrophoresis? 3. What are the charges of DNA and RNA? 4. In which direction do DNA and RNA move during electrophoresis? 5. In which direction do proteins move during electrophoresis? 6. What is the function of loading dye? 7. How do you visualize DNA on the gel? 8. What are the applications of DNA fingerprinting? 9. What are the applications of restriction endonucleases? 10. What is the application of PCR?
Sri K.
Early evidence that helped researchers define nucleosome structure is illustrated by the agarose gel below (next page), in which the thick bands represent DNA. This result was generated by briefly treating chromatin with an enzyme that degrades DNA, then removing all protein and subjecting the purified DNA to electrophoresis. Numbers at the side of the gel denote the position to which a linear DNA of the indicated size would migrate. What does this gel tell you about chromatin structure? Why are the DNA bands thick and spread out rather than sharply defined?
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