In the experimental evaluation of a new drug, what is the purpose of a placebo?
a. A placebo increases the sample size.
b. A placebo prevents errors in recording of the data.
c. A placebo removes the bias of the physician in charge of the experiment.
d. A placebo removes the potential psychological bias of the patient in the study.
e. A placebo prevents sampling errors from compromising the results of the experiment.
d
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Overproduction of epinephrine and norepinephrine can cause ____
a. increased digestive processes b. the formation of a tumor in the adrenal medulla c. increased heart rate d. increased blood flow to the kidneys and intestines e. decreased blood flow to the heart
Humus does not include:
a. feces b. dead organisms c. leaf litter d. weathered rock e. decomposing organic matter
Identify the labeled structures of the female reproductive system.
What will be an ideal response?
A DNA molecule containing 32% thymine would contain how much cytosine?
A. 18% B. 36% C. 32% D. 64%