Why has polio been eradicated in the U.S. but is still present in developing nations, including Afghanistan and Pakistan?
What will be an ideal response?
Although developed nations have been able to acquire and distribute vaccines against polio, certain war-torn developing nations do not have the resources to focus on vaccine initiatives. Religious or cultural practices may also influence acceptance of vaccination, as they sometimes do in the United States. However, this is a world-wide problem because as long as one person is left infected, it could quickly spread all over the world if vaccination efforts are stopped too soon.
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The step of translation in which release factors bind to a stop codon is
A. mitosis. B. initiation. C. transcription. D. elongation. E. termination.
Whether a mutation is ultimately considered harmful,
neutral, or lethal is often determined by a. phenotype. b. the will of the individual. c. the Hardy-Weinberg formula. d. environment. e. fate.
A human male diploid cell has which sex chromosome combination?
a. XX b. XY c. YY d. X e. Y
What is the infective form of Entamoeba histolytica and Giardia intestinalis?
A) cysts B) trophozoites C) merozoites D) sporozoites