The disease known as dengue hemorrhagic fever is actually
A. a hyperimmune response to reinfection with the dengue virus.
B. an immediate immune reaction to the initial infection with the dengue virus.
C. an antibody-antigen complex reaction.
D. the result of co-infection with other arboviruses.
E. the chronic carrier state of the dengue virus.
Answer: A
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Before stem cell research was such a prominent topic in the news, many people were misinformed about embryonic stem cell research
Many people thought that this form of stem cell research could be completed only by collecting stem cells from electively aborted fetuses. Explain specifically where embryonic stem cells come from when used for research and why these cells would not typically be found in aborted fetuses.
All of the following are appropriate strategies for overcoming drug resistance in bacteria except
A. decreasing the use of antibiotics in agriculture. B. prudent use of antibiotics when treating viral infections. C. heightened infection control in health care facilities. D. patient compliance with dosage instructions when taking antibiotics.
The evolution of development of snout-length in cichlid fish is best explained by
A. a single gene mutation. B. the modification of an existing gene for a new function. C. homoplastic convergence. D. gene duplication and divergence. E. conserved genes.
Background extinction rates once eliminated seven to eight species per year
a. True b. False