A rise in sodium levels and extracellular
volume leads to a rise in blood pressure. As a
result,
a. renin levels rise, but aldosterone levels fall.
b. renin levels fall, but angiotensin levels rise.
c. renin and aldosterone levels all rise.
d. renin and aldosterone levels all drop.
e. none of these occur
D
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Which of the following choices shows these steps in the correct order?
The steps of DNA fingerprinting are shown below. 1. Isolate DNA from samples 2. Label DNA with fluorescent marker 3. PCR using primers that flank STRs 4. Detection of fluorescent fragments 5. Gel electrophoresis A. 1 - 2 - 3 - 4 - 5. B. 1 - 2 - 3 - 5 - 4. C. 1 - 5 - 3 - 2 - 4. D. 1 - 3 - 2 - 5 - 4. E. 3 - 1 - 2 - 5 - 4.
Your patient was admitted for a gunshot wound about a week ago. As a precautionary activity, the doctor placed her on antibiotics for a few days while recuperating. Blood specimens are drawn on the patient a several times daily and sent to the microbiology lab for analysis of bacteria. Nothing has grown in culture. On her 4th day in the hospital, she has had no fever and no other signs of infection, but one set of blood specimens has been reported positive for a bacterium. The culture was identified by the lab as Staphylococcus epidermidis, a common organism on the skin. Predict the likely situation leading to this.
A. The patient is immunodepressed and very susceptible to bacterial infection. B. Staphylococcus epidermidis is a skin contaminant that ended up in the blood specimen as a consequence of poor aseptic technique during the venipuncture. C. Staphylococcus epidermidis has converted to a pathogen because of the antibiotics prescribed for the patient. D. Staphylococcus epidermidis is a very slow growing bacterium and was probably in the blood right after the gunshot wound, but failed to grow until now.
If an ecosystem has a carrying capacity of 1,000 individuals for a given species and 2,000 individuals of that species are present, we can predict that the population
A) size will remain at equilibrium. B) size will decrease. C) will show a clumped dispersion pattern. D) size will slowly increase.
Female fire beetles, Melanophilia sp., must seek out freshly burned trees to lay their eggs in so the larvae can feed on the burned wood. What specialized neural structures might you expect these beetles to have to facilitate this behavior?
A. Extra large axons for rapid axonal transduction B. Giant brain structures for processing auditory information C. Special, enlarged synapses for rapid synaptic transmission D. Special sensory structures that can detect signs of fire or burned wood