Describe what is measured during the first three phases of clinical trials
What will be an ideal response?
Phase I enrolls about 80 healthy patients to observe drug side effects. Phase II enrolls
about 300 patients who have the disease to confirm efficacy and set dosages. Phase III enrolls
between 1,000 to 5,000 patients and serves to show the efficacy of the drug against other drugs
on the market or against a placebo. It is the longest-running phase of clinical trials.
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Researchers applied radioactive phosphorus and radioactive calcium to a freshly cut tree stump. Eight days later, they came back to measure the distribution of the radioisotopes. They found that nineteen different species of shrubs and trees within a seven-meter radius had taken up the radioactive elements. No radioactivity was detected in the air. Radioactive isotopes were never detected in any samples containing just soil taken during the experiment. The finding implies that the
a. soil does not provide the ecosystem with minerals b. isotopes were undetectable in very small amounts c. isotopes were transported via vascular tissues d. plants quickly return minerals to the soil in which they grow e. soil speeds up radioactive decay
What is the apical complex of apicomplexans used for?
a. food absorption b. attachment c. structural support d. asexual reproduction
What are important for the digestion of proteins
What will be an ideal response?
Which of the following is a hormone produced by adipose cells that helps to control appetite?
A) insulin B) bile C) gastrin D) leptin