What type of cell helps to stimulate B cells to produce antibodies?
A) mast cell
B) cytotoxic T cell
C) helper T cell
D) macrophage
Answer: C
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As shown in Figure 25.1 (and reproduced here), atmospheric CO2 levels oscillate over the course of the year. What season would you expect oxygen levels to be highest?
A. summer B. fall C. winter D. spring
Which of the following pairs shares a similar function?
A) adhesive junction–tight junction B) desmotubule–gap junction C) tight junction–gap junction D) plaque–plasmodesma E) connexon–desmosome
Four of the following are major features of arthropods. Which is the exception?
A. Jointed appendages B. Exoskeleton C. Paired segmental nephridia D. Specialized segments that are fused together E. Specialized sensory structures
Which is true of predictions about the expected population of the United States in the year 2050?
A) Emigration is expected to have a large effect on the U.S. population. B) The population is expected to grow about 43 percent. C) Immigration is not expected to have a large effect on the U.S. population. D) The U.S. population will exceed 1.5 billion.