Which of the following is true of the Salk 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.
A
You might also like to view...
Wetland protection is one of the most controversial provisions of the ________ because opponents believe that the legislation is ________.
A. Clean Water Act; an infringement on their use of private property B. Clean Water Act; ineffective because it does not prevent pollutants C. Land Use Act; an infringement on their use of private property D. Clean Air Act; ineffective because it does not prevent pollutants E. Endangered Species Act; an infringement on their use of private property
What maintains a forced wave?
a. Wavelength b. Wind c. Disturbing force d. Restoring force
In polar and alpine regions, the thawing and saturation of the upper layer of soil results in a slow downslope movement called
A) transitional slide. B) solifluction lobe. C) lahar. D) mudflow.
River bottoms and delta regions have a very deep topsoil layer.
Answer the following statement true (T) or false (F)