During the first few years after menopause, follicle-stimulating hormone (FSH) levels are normally extremely high. A 56-year-old woman completed menopause 3 years ago. However, she is found to have low levels of FSH in her blood. Which of the following is the best explanation for this finding?

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#Question id: 23707

#Unit 13. Methods in Biology

Which of the following separates molecules by movement due to size and electrical charge?

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#Question id: 23708

#Unit 13. Methods in Biology

In order to identify a specific restriction fragment using a probe, what must be done?

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#Question id: 23709

#Unit 13. Methods in Biology

Which of the following modifications is least likely to alter the rate at which a DNA fragment moves through a gel during electrophoresis?

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#Question id: 23851

#Unit 13. Methods in Biology

DNA fragments from a gel are transferred to a nitrocellulose paper during the procedure called Southern blotting. What is the purpose of transferring the DNA from a gel to a nitrocellulose paper?

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#Question id: 23852

#Unit 13. Methods in Biology

RFLP analysis can be used to distinguish between alleles based on differences in which of the following?

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#Question id: 23853

#Unit 13. Methods in Biology

The segment of DNA shown in Figure, has restriction sites I and II, which create restriction fragments A, B, and C. Which of the gels produced by electrophoresis shown below best represents the separation and identity of these fragments?