What type of estuary is created by glacial retreats?
a. A bar-built estuary
b. A drowned river valley estuary
c. A tectonic estuary
d. A fjord
d
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A new virus is discovered that causes cells to lyse. Which of the following types of assay would be useful for diagnosing infection with this virus?
A) agglutination B) complement fixation test C) viral hemagglutination D) both agglutination and complement fixation tests E) viral neutralization
When a DNA sequence is transferred into a host cell from another cell, the resulting new form of DNA is called
A. a clone. B. GM organism. C. recombinant DNA. D. plasmid.
Researchers have determined that the growth of hormone-responsive breast cancer cells depends upon ____
a. the relative concentrations of ER? and ER? in the tumor cells b. the ability of ER? to stimulate cancer cell growth c. the ability of ER? to inhibit cancer cell growth d. whether DNA binding sites exists for ER?, but not ER? e. the relative concentrations of estrogen and testosterone in breast tissue
One way that antibiotic-resistant strains of bacteria arise is that patients do not follow the instructions for taking the drug. In a typical scenario, a drug may be prescribed for a week, but the patient may stop taking it after 2 to 3 days if they start to feel better. Then when the infection flares up again, they take the rest of their dose. Why would this scenario lead to drug resistance?
A. The first round of treatment gives the bacteria a chance to learn how to metabolize the drug. B. A patient begins to develop resistance to the drug. C. The body clears the drug faster, once it is exposed a second time. D. The first round of treatment does not kill the most resistant bacteria, which then increase in number. E. The first round of treatment suppresses the immune system, making the patient more susceptible to other infections.