In an experiment testing the efficacy of cough syrup Brand X, researchers selected 500 participants for the study, and created a control and a placebo group. For this experiment to be considered controlled, a criterion is that:
A) the groups must contain a large number of participants to ensure statistical significance.
B) no variation exists among the control group.
C) no variation exists among the 500 participants.
D) the variation between the participants is randomly divided into the two groups.
E) the researchers must never know the group in which the participants are included.
D) the variation between the participants is randomly divided into the two groups.
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Robotic systems used to quickly test thousands of combinations of nutrients for enrichment of a particular prokaryotic species is an example of a(n) ________ technology
A) outdated B) biased C) genomic D) high-throughput
Which reagent can be used to detect proteins?
a. biuret b. Nile blue c. ninhydrin d. orcinol
Four of the five answers listed below are portions of the theory of natural selection. Select the
exception. a. variation is heritable b. heritable traits vary in adaptability c. more organisms are produced than can survive d. the largest and strongest always contribute more genes to the next generation e. natural selection is the result of differential reproduction
Figure 40.7
Where does hormonal adjustment to solute and volume levels occur?
A. A B. B C. C D. D E. C and D