Which of the following is most important in stomatal closing?
a. declining sucrose concentrations
b. rising sucrose concentrations
c. rising potassium concentrations
d. declining potassium concentrations
e. declining chloride concentrations
A
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The first wildlife refuges were established in the United States shortly after 1960.
a. true b. false
Given what we know about evolutionary biology, we expect to find the largest number of endemic species in which of the following geological features, which have existed for at least a few million years?
A) an isolated ocean island in the tropics B) an extensive mountain range C) a grassland in the center of a large continent, with extreme climatic conditions D) a shallow estuary on a warm-water coast
Antigen stimulation causes B cells to multiply and differentiate into ________ and ________
a. plasma cells / memory cells b. antigen-presenting cells / memory cells c. plasma cells / natural killer cells d. antibodies / natural killer cells
In the biochemical oxygen demand (BOD) test, the factor that should limit biological activity is ________.
A. phosphorus B. carbon C. nitrogen D. oxygen