What is the purpose of using 4?, 6-diamidino-2-phenylindole (DAPI) in epifluorescence microscopy?
a. to determine the population of active cells
b. to determine the abundance of specific bacterial taxa
c. to observe both dead and alive cells
d. to quantify and distinguish bacterial cells from others in the sample (e.g., diatoms and fungi)
Answer: C
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The two amino acids in the accompanying figure both have side groups (R groups) that are ____
a. acidic and polar b. uncharged and nonpolar c. basic and polar d. acidic and nonpolar e. uncharged and polar
Which antibody is concentrated in the respiratory tract?
A. IgD B. IgG C. IgA D. IgE E. IgM
Which zone of a lake is closest to the shore?
a. Littoral b. Estuary c. Profundal d. Limnetic e. None of these choices.
What would you predict would happen in an area of the body where blood was relatively acidic (low
pH)?
a. O2 would bind more readily to hemoglobin. b. CO2 would bind more readily to hemoglobin. c. O2 would release from hemoglobin. d. CO2 would release from hemoglobin. e. binding of O2 by hemoglobin would cease.