Which of the following amino acids is not commonly phosphorylated to regulate protein activity?
a. Serine
b. Threonine
c. Tryptophan
d. Tyrosine
Ans: c. Tryptophan
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A patient's serum is analyzed and found to have an abnormally low level of CD8 molecules. This
suggests that the patient has insufficient numbers of
a. macrophages. b. B cells. c. cytotoxic T cells. d. helper T cells. e. NK cells.
In California, a species of salamanders were geographically separated over time. The group that lived in southern California relied heavily on large gold blotches on their skin that helped to camouflage them from predators. The group that lived along the coast adopted a color pattern that mimicked a poisonous, colorful newt common to that area. Instead of being camouflaged, these salamanders advertised their colors. What type of selection process has occurred over time?
A. theoretical selection B. natural selection C. experimental selection D. artificial selection
When does bone remodeling occur?
Until teenage years When tiny cracks in bones occur after a jump from a high place Bone remodeling is a lifelong process Both B and C
A sample of the tissue from an inflamed, pus-filled area on the lower leg is treated with KOH and stained with GMS. Under the microscope golden brown spheres are visible. With what disease are these observations consistent?
A. pityriasis B. fungemia C. chromoblastomycosis D. mycetoma E. sporotrichosis