After binding to an infected cell, the cytotoxic T cell
A) releases histamine.
B) becomes a phagocytic cell.
C) neutralizes the infecting bacteria or viruses.
D) releases a protein called perforin.
Answer: D
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All of the following are contributing to the current imbalance of the carbon cycle
a. deforestation b. photosynthesis c. burning of fossil fuels d. ALL of the above are contributing to the current imbalance of the carbon cycle
A high hematocrit might indicate
A) anemia. B) too many white blood cells in circulation. C) inadequate red blood cell production. D) excessive production of platelets. E) polycythemia.
The deepest layer of the skin is the stratum corneum
____________________ Indicate whether the statement is true or false.
Homo rudolfensis was discovered by
A. Raymond Dart. B. Richard Leakey. C. Charles Darwin. D. Donald Johanson.