Physician Edward Jenner promoted the use of cowpox, a harmless pathogen related to the dangerous smallpox, as a vaccination to provide patients immunity from future smallpox epidemics. This is an example of
A. active immunity.
B. passive immunity.
C. an inflammatory response that decreased the IgE production and increased T cells.
D. developing high levels of interferon although Jenner did not realize these diseases were viral.
E. developing high levels of complement.
Answer: A
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A researcher is studying eukaryotic cells that shows an abnormal pattern of surface glycosylation. The researcher determines that these cells have normal levels of glycolipids and integral membrane proteins with O-linked glycosylation. The researcher discovers that there are no N-linked glycosylated proteins on the cell surface and unusually high levels of glycosylated in the ER membrane. What is a reasonable hypothesis to explain this observation?
A. The cell is defective in synthesizing of carbohydrates B. The cell is defective in assembling carbohydrate trees C. The cell has a defective oligosaccharide transferase D. The cell has a defect in its protein sorting pathway E. The cell has a defect in its ER localization signal
Ultraviolet light damages DNA by causing
A) purine rings. B) strand breaks. C) thymine dimers. D) radioactivity.
Large habitat patches typically contain more individuals and species than smaller habitat patches
Indicate whether the statement is true or false
In the accompanying figure, the purpose of electrical shock at the stage of the process labeled as A is to:
a. kill the egg cell nucleus. b. initiate fusion of the two cells. c. stimulate cell division. d. induce mutations. e. initiate apoptosis.