Researchers studying variations in oldfield mouse coat color found that the light coat color of many beach populations was due to:

a. a mutation in the Mc1R protein that reduces the ability of ?-MSH to bind.
b. a mutation in the regulatory region of the Agouti gene increases ASP expression.
c. a reduction in eumelanin production.
d. All of the above.


D

Biology & Microbiology

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Which molecule can enter the Krebs cycle reactions?

a. glucose

b. pyruvate c. carbon dioxide d. NADH e. acetyl-CoA

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Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?

A) centromere B) centrosome C) centriole D) chromatid E) kinetochore

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In Drosophila, the cells created by cleavage contain different developmental signals from the egg called cytoplasmic

A. determinants. B. signals. C. junctions. D. stem cells.

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