Please order the following choices to reflect the mechanism and development of an immediate (Type 1) allergic reaction.
> A provoking exposure to the allergen occurs and mast cells and basophils degranulate, releasing histamine and other allergic mediators.
> Individual experiences allergy symptoms.
> B cells produce IgE directed against the allergen.
> IgE coats (sensitizes) mast cells and basophils.
> Individual is exposed to a sensitizing dose of an allergen.
> Individual is exposed to a sensitizing dose of an allergen.
> B cells produce IgE directed against the allergen.
> A provoking exposure to the allergen occurs and mast cells and basophils degranulate, releasing histamine and other allergic mediators.
> Individual experiences allergy symptoms.
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The same hormone stimulates gene expression in one cell, but inhibits gene expression in another cell. What is the best explanation for this difference?
A. The two cells have different types of receptors for the hormone. B. The two cells receive different amounts of the hormone. C. The two cells receive the hormone at different times. D. The hormone is degraded more quickly in one cell than the other. E. The hormone can diffuse through the plasma membrane of one cell, but not the other.
In mitosis
A) One diploid cell forms two haploid cells B) One diploid cell forms two diploid cells C) One diploid cell forms four haploid cells D) One diploid cell forms four diploid cells
What is the role of the villi?
A) To absorb small nutrient molecules from the digestive tract
B) To move food along the digestive tract
C) To secrete digestive enzymes into the digestive tract
D) To secrete water into the digestive tract
Comparing the evolution of domesticated dogs to the evolution of wolves over the same time period illustrates what relationship between artificial and natural selection?
A. In artificial selection, the magnitude of the selection pressure can be varied; in natural selection, it cannot. B. Artificial selection is more likely to produce maladaptive structures than natural selection. C. Artificial selection is slower than natural selection. D. Artificial selection cannot produce changes as large as changes produced by natural selection. E. Artificial selection is reversible; natural selection is not.