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.

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology