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A scientist wants to compare the DNA of two plants.What technique can she use to produce bands of DNA fragments for this comparison?Choose 1 answer:Choose 1 answer:(Choice A)   ChromatographyAChromatography(Choice B)   Gene therapyBGene therapy(Choice C)   DNA cloningCDNA cloning(Choice D)   Gel electrophoresisDGel electrophoresis

Question

A scientist wants to compare the DNA of two plants.What technique can she use to produce bands of DNA fragments for this comparison?Choose 1 answer:Choose 1 answer:(Choice A)   ChromatographyAChromatography(Choice B)   Gene therapyBGene therapy(Choice C)   DNA cloningCDNA cloning(Choice D)   Gel electrophoresisDGel electrophoresis

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Solution

The scientist can use (Choice D) Gel electrophoresis to produce bands of DNA fragments for comparison. This technique separates DNA fragments according to their size. The DNA fragments are placed in a gel and an electric current is applied. Smaller fragments move faster and therefore further than larger ones, creating a pattern of bands. This pattern can then be compared between the two plants.

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Based on the gel results in the previous question, which of the following statements is correct? The DNA fragments in band B are shorter than the DNA fragments in band C The DNA fragments in band B are longer than the DNA fragments in band C The DNA fragments in band B are roughly the same length as the DNA fragments in band C

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Write a method to extract DNA ( give a reason for completing each step)

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