Systematists often use DNA sequencing in ________, the study of the order of evolutionary events within a group sharing derived characters.
Fill in the blank(s) with the appropriate word(s).
cladistics
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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.
How much nitrogen is fixed by free-living organisms in soils relative to symbionts?
a. 100x b. 10x c. 1% d. 10%
The fibrous proteins underlying the inner nuclear membrane are
a. band 3s. b. collagens. c. keratins. d. lamins.
When a virus has a broad host range
A. it does not require close contact to infect a new host. B. it can infect many different cell types. C. it can infect many different species. D. the species that the virus can infect are spread over a large geographic distance, potentially causing pandemics. E. it can infect many cell types or species.