Helper T-cells
A. suppress immune reactions.
B. directly destroy target cells.
C. activate B-cells and other T-cells.
D. secrete antibodies.
E. function in allergic reactions.
Answer: C
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constricting many arterioles.
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Nile blue is used to test for the presence of amino acids
a. True b. False
The branch of science that deals with the naming and grouping of organisms is known as
A) histology. B) molecular biology. C) chemistry. D) taxonomy. E) ecology.
Occasionally, an episode of food poisoning occurs which centers around processed ham, sausage, or salted pork. These episodes are almost always assumed to be due to ingestion of Staphylococcus aureus unless other evidence proves differently. This is because
A) People whose diet include high-fat foods such as these are more susceptible to infection with Staphylococcus aureus. B) Staphylococcus aureus is one of the few bacteria able to multiply in foods as salty as sausage, ham, or salted pork. C) Staphylococcus aureus is responsible for most episodes of food poisoning. D) Staphylococcus aureus is able to take advantage of the high-fat content found in these foods better than other bacterial species.