The steepness of the concentration gradient across the respiratory membrane affects gas exchange, with a steeper gradient ____
a. decreasing the rate of gas exchange
b. increasing the rate of gas exchange
c. decreasing the levels of carbon dioxide in the blood only
d. increasing the levels of hemoglobin-bound oxygen only
e. increasing the number of red blood cells
b
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Which of the following disorders is the result of impaired glycosphingolipid metabolism?
A) leprosy B) glycosphingolipid anemia C) polydactyly D) tuberculosis E) Tay-Sachs disease
The distribution of animals and plants in
competition for scarce resources is likely to be a. clumped. b. random. c. near-uniform. d. constant. e. homogeneous
In your analysis of a newly discovered bacterial species, you find the bacteria reduce carbon dioxide to organic compounds but do not produce oxygen. The nutritional mode of this new bacterial species is most likely
A. anoxygenic chemoautotroph. B. anoxygenic photoautotroph. C. oxygenic chemoautotoph. D. anoxygenic chemoheterotoph. E. oxygenic photoautotroph.
Which of the following causes infectious sores on the mucous membranes of the mouth that occur during times of stress?
A) Herpes virus B) Escherichia C) Prions D) Listeria E) Bacillus anthracis