The most significant role played by pH buffers is to
A. prevent fluctuations in the acidity of solutions.
B. increase the strength of acids and bases.
C. keep pH low.
D. limit major shifts in the amount of H+ and OH- in solution.
E. prevent fluctuations in the salinity of solutions.
Answer: D
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Traditional and molecular phylogenies disagree on which one of the following issues?
A. whether or not the Eumetazoa are monophyletic B. whether the Bilateria and Radiata split early into separate monophyletic clades C. whether the split between Parazoa and Eumetazoa occurred at a very early stage in animal evolution D. whether Echinodermata and Chordata are both deuterostomes E. whether the appearance and type of coelom is important in interpreting phylogeny
Which of the following defines the benthic realm?
a. The area of the ocean that is considered open water. b. The area of the ocean into which no light can penetrate. c. The area that extends along the ocean bottom along the shoreline to the deepest parts of the ocean floor. d. The area of the ocean between high and low tide that is the oceanic region closest to land.
Antidiuretic hormone (ADH) decreases the amount of water absorbed by the kidneys and increases the volume of urine output.
a. true b. false
Why does taking antibacterial medications put women at risk for candidiasis?
A) Antibacterials can alter metabolism, creating conditions that favor the growth of Candida albicans. B) Antibacterials deplete the normal bacterial microbiota, resulting in a change of pH. C) Antibacterials serve as growth stimulants for Candida albicans. D) Bacteria killed by antibacterials provide nutrients for Candida albicans. E) Depletion of the bacterial microbiota results in higher carbon dioxide levels, (which favor the growth of Candida albicans).