Maintaining a constant cell population in a chemostat requires the monitoring and control of
a. nutrient concentrations.
b. the dilution rate of volume pumped in.
c. the population's waste products.
d. all of the above.
Answer: D
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Once heat is transferred to the soil, where does it go next (reference the study by Noormets et al. 2004)?
I) The heat is emitted back to the atmosphere. II) The heat is transferred to other soil layers. III) The heat is stored in the soil. A) only I B) only II C) only III D) only II and III E) I, II, and III
Stabilizing selection occurs when
a. the environment controls which organisms will survive. b. humans determine which organisms will survive. c. the extremes of the population have a lesser chance to survive. d. the extremes of the population have a better chance to survive. e. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.
Dormancy can be triggered by
a. low Pfr levels. b. the production of abscisic acid. c. nitrogen deficiency and low soil moisture. d. cold nights. e. all of these.
All of the chemical reactions that take place within your body are known as
A. organismal structure. B. metabolism. C. irritability. D. adaptation.