In the wake of the recent Ebola outbreak in West Africa, researchers have observed infectious Ebola virus is present in the eyes and semen of infected individuals months after apparent recovery from the acute stage of the disease. Based on information in this chapter, propose an explanation for this observation
What will be an ideal response?
The eyes and testes are "hidden" sites which T cells do not normally enter. Virus infections are most effectively cleared by cell-mediated responses. CTL against Ebola virus cannot enter these areas under normal circumstances to attack infected cells, so the virus is not cleared from these organs.
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Altruistic behavior is
a. selfish. b. sexually directed behavior. c. self-sacrificing behavior. d. aggressive behavior. e. nonreactive, such as freezing at the sign of danger.
A definitive host harbors which stage of a parasite?
A) Miracidium B) Larva C) Adult D) Cyst E) All of the above
Commercial logging:a
cuts trees primarily for use by developing countries. b. cuts trees for subsistence farmers. c. cuts trees primarily for export. d. is a very sustainable practice in the tropics. e. is most prevalent in temperate deciduous forests.
A component of the plasma membrane that helps to maintain its fluidity is:
A) cholesterol. B) nucleic acid. C) protein. D) the phospholipid bilayer. E) carbohydrate.