The pulmonary artery carries blood away from the ____
a. aorta
b. right atrium
c. right ventricle
d. left atrium
e. left ventricle
c
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Which of the following diseases is not caused by an obligate intracellular pathogen?
A) chlamydial urethritis B) human monocytic ehrlichiosis C) Rocky Mountain spotted fever D) typhoid fever
A dominant allele is found in a population with a frequency of 0.8. As the environment begins to change, the dominant allele is not favored. Scientists find that the frequency of the dominant allele decreases by half each generation. What are the allele, genotype, and phenotype frequencies before and one generation after the population begins to change? Is Hardy-Weinberg equilibrium maintained?
What will be an ideal response?
Select the best response to the question. ?
?Lyme disease, an illness spread by ticks, is an example of: A) ?transmission by direct contact. B) common vehicle transmission.? C) ?mechanical vector transmission. D) ?biological vector transmission.
The major way that meiosis II differs from mitosis is that
A. in meiosis II, the daughter cells are haploid. B. in meiosis II, the homologues separate. C. in meiosis II, a synaptonemal complex is formed. D. in meiosis II, the homologous sister chromatids align at the metaphase plate as a tetrad. E. in meiosis II, a pair of sister chromatids move to the pole.