Which cells are involved in a secondary response?
a. Memory B cells and plasma cells
b. Memory B cells
c. T cells
d. Plasma cells
Answer: a. Memory B cells and plasma cells
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The drug of choice for the treatment of granuloma inguinale, which is a major cause of genital ulcers in India, New Guinea, and part of South America, is:
a. clindamycin. b. doxycycline. c. imipenem. d. gentamycin.
In water, MgCl2 dissociates into Mg2+ and Cl-. Based on this information what type of bond is involved in the formation of MgCl2?
A. hydrogen. B. ionic. C. polar covalent. D. nonpolar covalent. E. electrostatic.
Human-caused disturbances of the ________ cycle may be contributing to global warming
A) hydrologic B) oxygen C) phosphorus D) carbon E) sulfur
In Griffith's experiments,
A. mice infected with live nonvirulent bacteria developed pneumonia and died. B. nonvirulent bacteria transformed the virulent bacteria into a nonvirulent variety. C. mice infected with heat-killed virulent bacteria and heat-killed nonvirulent bacteria developed pneumonia and died. D. mice infected with heat-killed virulent bacteria and live nonvirulent bacteria developed pneumonia and died.