Could two normal parents have a child with sickle-cell anemia?
a. yes
b. no
a
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Under Hardy-Weinberg equilibrium:
a. Genotypic frequencies change slowly over time. b. Genotypic frequencies change quickly over time. c. Genotypic frequencies do not change over time.
The blue and red dots in this figure represent genetically different _____
1.Spores
2.Gametes
3.Nuclei
4.Hyphae
During presentation of APC-bound antigen, macrophages and dendritic cells secrete the cytokine ________, which activates T helper cells.
A. histamine B. interleukin-2 C. interferon D. interleukin-1
The easiest way to prevent Taenia infection in humans is to
A) vaccinate cows and pigs. B) vaccinate humans who are in contact with cows and pigs. C) spray pastures and grazing lands with toxins that kill the parasite. D) thoroughly cook or freeze meat. E) identify patients with cysticerci in their muscles.