In an antibody- mediated immune response, what causes effector helper T cells to release cytokines?
a. binding to antigen presenting dendritic cells
b. binding to a bacterial complement
c. binding to a naive helper T cell
d. binding to a B cell
e. engulfing a bacterium
ANSWER: d
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Which of the following statements is true about the phylogenetic tree shown here?
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How is parasitism different from commensalism?
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