How have ocean waters been affected by increased amounts of carbon dioxide in the atmosphere?
A) more acidic
B) more basic
C) closer to neutral in pH
D) richer in aquatic species
A
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The cells that function with the sieve tubes are the
a. vessel members. b. companion cells. c. adjunct cells. d. sclereids. e. periderm.
Which of the following drug categories are used to treat HIV infections?
A) integrase inhibitors B) protease inhibitors C) reverse transcriptase inhibitors D) DNAse inhibitors E) fusion inhibitors
The circulatory system of cephalopods is closed, whereas that of all other mollusks is open. Explain the difference
between open and closed circulatory systems, and describe how each system is adequate for the groups possessing it. What will be an ideal response?
Which of the following is most likely to occur when a tumor-suppressor gene is mutated?
A. The resulting tumor-suppressor protein would further suppress cell proliferation. B. The tumor-suppressor gene and resulting protein may lose its function and ability to suppress cell proliferation. C. The tumor-suppressor gene may be overactive. D. The resulting tumor-suppressor protein would activate an oncogene. E. None of the choices are possible.