Which of the following statements about the abnormal mucous production associated with cystic
fibrosis is NOT correct?
a. The mucus blocks the action of the cilia that line the bronchi.
b. The mucus promotes the growth of dangerous bacteria in the respiratory system.
c. The mucus is in the respiratory system is abnormally viscous.
d. Abnormal mucous secretions occur throughout the body systems.
e. Abnormal mucous secretions inhibit infections by bacteria.
E
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The figure above shows the distribution of pocket-mouse coat colors in several Arizona populations found either on light-colored granite substrate or on dark volcanic rock (dark substrate)
The Melanocortin-1 receptor (Mc1r) alleles, D and d, differ by four amino acids. Mice with DD and Dd genotypes have dark coats, whereas mice with the dd genotype are light colored. What sort of genotype frequencies might you expect to find in the Xmas, Mid, and O'Neill populations? A) Xmas-high DD frequency; Mid-high Dd frequency, O'Neill-high dd frequency B) Xmas-high Dd frequency; Mid-high DD frequency, O'Neill-high dd frequency C) Xmas-high Dd frequency; Mid-high dd frequency, O'Neill-high DD frequency D) Xmas-high dd frequency; Mid-high Dd frequency, O'Neill-high DD frequency E) Xmas-high dd frequency; Mid-high DD frequency, O'Neill-high Dd frequency
While electron transport is occurring, the development of a(n) ________ is established by the directional pumping of protons across the inner membrane of the mitochondrion.
Fill in the blank(s) with the appropriate word(s).
The energy-requiring process by which liquid water becomes water vapor (a gas) is
A. All of the answer choices are correct. B. sublimation. C. condensation. D. evaporation. E. convection.
Development of drug resistance is encouraged by ________.
A. use of two drugs simultaneously with the hope that each will prevent the emergence of resistance to the other B. avoidance of indiscriminate use of drugs C. widespread use of broad-spectrum drugs D. use of a high enough concentration of the drug to destroy any spontaneous resistant mutants that might arise E. using drugs appropriate for the infectious agent being treated