Cytoplasm in a plant cell will shrink if the cell is
a. placed in a concentrated salt solution
b. kept warm and moist and in medium light
c. placed in distilled water
d. exposed to a different concentration of nitrogen gas
Answer: a. placed in a concentrated salt solution
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Currents in the ocean basins of the Northern Hemisphere always run in what direction?
A. counterclockwise B. clockwise C. north to south D. from the equator to the poles E. from the poles to the tropics
Consider a community in which the vaccination rate for measles is 99 percent. Ryan, a 2-year-old with leukemia, has not received the measles vaccination because of his immunocompromised status. Ryan is unlikely to get measles because
A. the measles virus does not typically affect children with leukemia. B. measles has been completely eradicated and is no longer a threat. C. there is substantial herd immunity in his community. D. he is protected by antibodies from his mother that crossed the placenta.
What are some of the problems associated with kidney transplants, and what are some ways the issues can be resolved?
What will be an ideal response?
Which of the following statements about T lymphocytes is FALSE?
A. T lymphocytes produce antibody molecules. B. T lymphocytes directly attack cells and produce the cell-mediated immune response. C. T lymphocytes mature in the thymus. D. T lymphocytes have TCRs that recognize unique antigens. E. T lymphocytes require antigen presentation to become activated.