The concept of "immune privilege" explains why the central nervous system has
A. a completely different set of immune responses.
B. more MHC markers than other tissues.
C. a reduced immune response compared to the rest of the body.
D. a greater immune response than the rest of the body.
Answer: C
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Carbon 14 radioisotopes decay into stable ____
nitrogen 15 isotopes
a. carbon 13 isotopes b. nitrogen atoms c. carbon atoms d. nitrogen 15 isotopes e. sodium atoms
In the central nervous systems, axons of several neurons traveling together are called ____
a. nuclei b. fibers c. bundles d. tracts e. filaments
Margarine is made by hydrogenating vegetable oils so that they take on the consistency of butter. Propose a chemical basis for this change from a liquid to a solid.
A. Hydrogenation of fats changes them from unsaturated to saturated, which are more solid. B. Trans-fatty acid are changed from saturated to unsaturated, allowing them to solidify. C. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify. D. Hydrogenation of fats changes them from saturated to unsaturated, which are more solid.
Which of the following molecules is least likely to be able to pass through a capillary wall?
A) an enzyme B) a sodium ion C) glucose D) oxygen