Questions: Why do DNA fragments in gel electrophoresis travel away from the negative electrode? Selected answer will be automatically saved.For keyboard navigation, press up/down arrow keys to select an answer. a ONA is positively charged, so it is attracted to the negative electrode b. DNA is negatively charged, soit is attracted to the positive electrode C The agarose gel in negatively charged d The agarose gel is positively charged

Why do DNA fragments in gel electrophoresis travel away from the negative electrode? Selected answer will be automatically saved.For keyboard navigation, press up/down arrow keys to select an answer. a ONA is positively charged, so it is attracted to the negative electrode b. DNA is negatively charged, soit is attracted to the positive electrode C The agarose gel in negatively charged d The agarose gel is positively charged
Transcript text: Why do DNA fragments in gel electrophoresis travel away from the negative electrode? Selected answer will be automatically saved.For keyboard navigation, press up/down arrow keys to select an answer. a ONA is positively charged, so it is attracted to the negative electrode b. DNA is negatively charged, soit is attracted to the positive electrode C The agarose gel in negatively charged d The agarose gel is positively charged
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Solution

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The answer is b: DNA is negatively charged, so it is attracted to the positive electrode.

Explanation for each option:

a. DNA is positively charged, so it is attracted to the negative electrode - This is incorrect. DNA is not positively charged; it is negatively charged due to its phosphate backbone.

b. DNA is negatively charged, so it is attracted to the positive electrode - This is correct. DNA molecules have a negative charge because of their phosphate groups. In gel electrophoresis, when an electric field is applied, DNA fragments move towards the positive electrode (anode) because opposite charges attract.

c. The agarose gel is negatively charged - This is incorrect. The agarose gel itself is neutral; it acts as a medium through which the DNA fragments can move. The charge of the gel does not influence the direction of DNA movement.

d. The agarose gel is positively charged - This is incorrect. Similar to option c, the agarose gel is neutral and does not have a charge that affects the movement of DNA fragments.

In summary, DNA fragments travel away from the negative electrode in gel electrophoresis because they are negatively charged and are attracted to the positive electrode.

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