The perforin-granzyme pathway involves
A. the production of fever, which kills the pathogen.
B. the production of antibodies toward the invading pathogen.
C. the production of special cell-killing proteins that act on infected or abnormal cells.
D. presenting the foreign antigen to B cells.
E. binding CD95L to infected cells, which eventually leads to cell apoptosis.
Answer: C
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Most of the carbon dioxide in the blood of humans is transported
A. as dissolved CO2 in plasma. B. as bicarbonate ion in plasma. C. attached to hemoglobin in red blood cells. D. attached to hemoglobin in plasma. E. as carbonic acid.
Members of the ____ phylum have bilaterally symmetrical larvae, but exhibit secondary radial symmetry as adults,
usually organized around five rays, or "arms."
a. Hemichordata b. Echinodermata c. Cnidaria d. Arthropoda e. Chordata
It is often times necessary to make reference to a base group in regression analysis, which denotes what?
A. The excluded dummy variable among a set of dummy variables representing a categorical, ordinal or interval variable. B. The control group in a randomized control trial. C. The preferred selection of control variables to have in the regression equation. D. The set of homoscedastic errors.
The strand of DNA for a particular gene that is copied by the RNA polymerase to form mRNA is called the ________ strand.
A. leading B. copy C. template D. transcription