Which of the following cells is associated with the humoral immune response?
a. T cells
b. B cells
c. phagocytic cells
d. natural killer cells
b. B cells
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While standard two-component regulatory systems typically act to control gene transcription, phosphorelay systems can act either to control gene transcription or to control .
A. DNA replication B. translation C. protein activity D. All of the choices are correct.
The acquisition of a key evolutionary innovation by a species gives evidence for the concept of
a. uniformitarianism. b. gradualism. c. convergence. d. adaptive radiation. e. special creation.
Gibberellin stimulates ____.
A. fruit ripening B. leaf abscission C. lateral root formation D. stem lengthening between the nodes E. stem lengthening at the tip
Which of the following is most likely to bind to sand particles in soil?
A. Potassium ions B. Sodium ions C. Lithium ions D. Chloride ions E. None of the above