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
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MacConkey agar and eosin-methylene blue (EMB) agar are ________ media
A) selective but not differential B) differential but not selective C) both selective and differential D) neither selective nor differential
Which molecule can enter the Krebs cycle reactions?
a. glucose
b. pyruvate c. carbon dioxide d. NADH e. acetyl-CoA
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
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.