Which of the following is true of the Sabin vaccine against the polio virus?
A) It contains a virus which has been inactivated by treatment with formaldehyde.
B) It contains a mutated form of the virus which is temperature sensitive.
C) It contains a very small amount of the natural virus.
D) None of the above is correct.
B
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When a population has unlimited resources, it grows ________. When a population grows at a fixed rate per amount of time, it grows ________.
A. exponentially; logistically B. logistically; logistically C. exponentially; exponentially D. logistically; exponentially
The cells that allow the immune system to respond more quickly to an antigen when it is encountered again later in life are called
A) innate immune cells. B) helper T cells. C) memory cells. D) killer T cells.
True or False: It is appropriate to criticize a scientific theory by saying "it's only a theory" because it is a tentative explanation that accounts for the existing data
Indicate whether this statement is true or false.
Why does seawater evaporate more slowly than freshwater?
a. The latent heat of evaporation is higher for seawater than freshwater. b. The dissolved salts attract and hold water molecules. c. The latent heat of evaporation is higher for freshwater than seawater. d. Salts are evaporating along with the water. e. The latent heat of vaporization is higher for seawater than freshwater.