When the air in a testing chamber is specially mixed so that its oxygen content is 10% and its overall air pressure is 400 mm Hg, then PO? is
A) 400 mm Hg.
B) 82 mm Hg.
C) 40 mm Hg.
D) 21 mm Hg.
E) 4 mm Hg.
Answer: C) 40 mm Hg.
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Mitochondria are proposed to have evolved before chloroplasts based on which observation?
A. All organisms have mitochondria and conduct cell respiration. B. Mitochondria are larger, with more complex structures than chloroplasts. C. Mitochondria produced the oxygen found in the atmosphere. D. All eukaryotes have mitochondria, but not all eukaryotes have chloroplasts. E. All prokaryotes have mitochondria, but not all prokaryotes have chloroplasts.
Cephalopods are the only mollusks that possess
a. a mantle. b. gills. c. a closed circulatory system. d. shells. e. a closed circulatory system and shells.
Most (90 percent) of all cases of ____________________ cancer involve mutations of the MSH2 or
MLH1 genes, which destabilize the genome. Fill in the blank(s) with the appropriate word(s).
Carbon, in the form of carbon dioxide (CO2), enters the atmosphere in several ways. Which of the following is NOT a process by which carbon dioxide enters the atmosphere?
A) cellular respiration of plants B) transpiration by plants C) respiration by oxygen-breathing animals D) burning of fossil fuels, such as coal and oil