Haemophilus ducreyi is transmitted by sexual contact
Indicate whether the statement is true or false
TRUE
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Trilobites are extant.
A-True B-False
The heart chamber that passes blood to the lungs is the
A. left ventricle. B. right ventricle. C. right atrium. D. left atrium.
Why is it important to include a placebo in a scientific study to assess the effectiveness of a drug?
A. It's actually unethical to do so-if you have a drug that you know to be effective, it's unethical to withhold that treatment from an ill patient. B. A placebo-treated group will determine if the changes observed in the drug-treated illness group are due to a psychological effect rather than a physiologic/pharmacologic one. C. It isn't scientifically important-a placebo simply helps investigators satisfy the legal requirements of the Food and Drug Administration in their testing process. D. A placebo-treated group will determine if the changes observed in the illness in this non-treated group are due to a physiologic/pharmacologic effect rather than a psychological one.
Which statement is NOT true?
a. Membranes are often perforated by proteins that extend through both sides of the membrane. b. Some membranes have proteins with channels that allow for the passage of hydrophilic substances. c. Hydrophilic substances have an easier time passing through the lipid bilayer than do hydrophobic substances. d. The current concept of a membrane is best summarized by the fluid mosaic model. e. All of these statements are NOT true