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

Biology & Microbiology

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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.

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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.

Biology & Microbiology

Human-caused disturbances of the ________ cycle may be contributing to global warming

A) hydrologic B) oxygen C) phosphorus D) carbon E) sulfur

Biology & Microbiology

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.

Biology & Microbiology