During presentation of APC-bound antigen, macrophages and dendritic cells secrete the cytokine ________, which activates T helper cells.
A. histamine
B. interleukin-2
C. interferon
D. interleukin-1
Answer: D
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The antimicrobial action of artemisinin is not well understood but this chemical appears to
A. raise the internal pH, clump the plasmodial pigment, and intercalate into plasmodial DNA. B. form reactive oxygen intermediates inside Plasmodium-infected red blood cells. C. inhibit heme polymerase, an enzyme that converts toxic heme into nontoxic hemazoin. D. swell the Plasmodium falciparum food vacuoles.
What type of symbiotic relationship is exemplified by athlete's foot?
A. Mutualism B. Commensalism C. Parasitism D. Atavism Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about athlete’s foot? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following has the greatest total
energy? a. cAMP b. ADP c. ATP d. glucose e. NADPH
If there is no natural selection, the
A. gene frequencies in a population remain constant. B. the frequency of dominant genes increases. C. the frequency of dominant genes decreases. D. the population will become extinct.