Immunological memory accounts for _____
A) the human body's ability to distinguish self from non-self
B) the observation that some strains of the pathogen that causes dengue fever cause more severe disease than others
C) the ability of a helper T cell to signal B cells via cytokines
D) the ancient observation that someone who had recovered from the plague could safely care for those newly diseased
D
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What is the primary difference between natural selection and artificial selection?
A. Natural selection results in evolution; artificial selection does not. B. Artificial selection is driven by humans. C. Artificial selection relies on traits that allow for greater reproductive success. D. Natural selection may select traits that are detrimental. E. Natural selection is controlled.
Which of the following statements regarding hypersensitivity are true? (Check all that apply.)
_____ The acceptance of self cells is known as immunological tolerance. _____ Allergies are caused by IgG secretion in response to antigens. _____ Autoreactive B cells produce autoantibodies causing inflammation. _____ Itchy welts or hives could be called a local anaphylaxis. _____ Delayed hypersensitivity is mediated by TH cells and macrophages.
Unripe green fruits ripen quickly in supermarkets or commercial storage facilities after exposure to:
a. abscisic acid. b. auxin. c. cytokinin. d. ethylene. e. gibberellin.
Which of the following is an underwater opening from which mineral-rich water heated by geothermal energy streams out?
A. Hydrothermal vent B. Iron–sulfur plume C. Geothermal geysers D. Continental shelf E. Undersea volcano