A mosquito becomes infected with West Nile virus and then it bites a human and transfers West Nile virus into the human's bloodstream. Which organism(s) is the vector in this case?
a. human
b. mosquito
c. bird
d. mosquito and bird
e. mosquito and human
b
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Which of the following bacterial pathogens is found in water distribution systems?
A) Enterobacter aerogenes B) Klebsiella pneumoniae C) Legionella pneumophila D) Vibrio cholerae
Which statement BEST describes the role and importance of mobile genetic elements in genomes?
A) Mobile genetic elements almost always have either neutral or deleterious consequences for their host. B) Mobile genetic elements are largely beneficial to hosts because they introduce new phenotypic variation into a population via transposition and/or duplication of important genes. C) Mobile genetic elements can have deleterious, neutral, OR beneficial consequences for the host organism, and all three kinds of outcomes are common. D) Mobile genetic elements are especially important for plant genomes such as the tomato, but they are not present in most animal genomes.
The tropical rain forest biome is characterized by:
a. high density of plants, but nutrient poor soil. b. high density of plants and nutrient rich soil. c. low density of plants due to nutrient poor soil. d. low density of plants, yet nutrient rich soil. e. intermediate density of plants and intermediate nutrient supply.
The immune complexes that are not removed by macrophages are:
A. intermediate sized B. very small C. large D. all of the above