Extreme hunting pressure has caused northern elephant seals to become less genetically diverse because of:
A) natural selection. B) population bottleneck.
C) genetic drift. D) founder effect.
Answer: B
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Your research project involves characterizing the expression pattern of a nuclear pore protein. After using immunohistochemistry to fluorescently label the protein, you decide that you would like to capture the data as a 3-D image. Which microscope should you use?
A. confocal microscope B. scanning electron microscope C. phase-contrast microscope D. fluorescence microscope
Absence of hair from areas where it normally grows
How are hormone levels regulated?
A. An endocrine gland can respond to the blood level of the hormone it produces. B. A product can trigger hormone production; the hormone can then reduce the amount of product which in turn reduces the level of hormone. C. A hormone can trigger a second gland to secrete a hormone that dampens production of the first hormone. D. A second contrary hormone can counteract the effect of the first hormone. E. All of the choices are correct.
PCR is a method for identifying microbes based on their (antigens/genes/morphology)
What will be an ideal response?