The main criteria presently used for grouping viruses does NOT include
A) structure.
B) chemical composition.
C) similarities in genetic makeup.
D) host infected.
Ans: D) host infected.
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____ is when one organism successfully outcompetes another organism and excludes it from a particular area or niche
a. Predation b. Resource partitioning c. Parasitism d. Competitive exclusion e. Commensalism
You have made a specific DNA probe that will bind to a key sequence on the DNA of Neisseria gonorrhoeae, allowing your company to market a gonorrhea test kit that can be used to identify the bacterium in genital tract specimens. However, upon testing it out against a known Neisseria gonorrhoeae culture, you find that it does not work. Which of the following is a possible explanation for this negative result?
A. You forgot to incubate the test at the 75°C temperature required for hybridization. B. You forgot to add the mRNA to the DNA probe sample. C. You forgot to label the probe sequence with a reporter molecule. D. You forgot to digest the probe with restriction endonucleases.
Which of the following is the best description of an adaptation?
a. a trait that was beneficial to survival in the past b. a trait that is currently beneficial to survival c. a trait that will be beneficial in the future d. a trait that is of no advantage to survival e. an environmental change that selects for certain traits
What is one mechanism through which increased density may cause infant mortality in mammals?
A) reduced social contact causes stress B) reduced seed bank causes a decrease of feed for infants C) increased stress increases infant size D) high stress environments may reduce lactation