The key phagocytic cells of the body are the
A. eosinophils and macrophages.
B. neutrophils and macrophages.
C. macrophages and monocytes.
D. natural killer cells.
E. basophils and neutrophils.
Answer: B
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Specific immunity in the extracellular fluid is provide by mainly
A. IgG and IgM B. IgM and IgD C. IgA and IgE D. IgD and IgA E. IgE and IgG
In the cells of a female mammal, ________ is(are) inactivated
a. either the maternal or paternal X chromosome b. all maternal X chromosomes c. all paternal X chromosomes d. both the maternal and paternal X chromosomes
is the specialized field of study that examines fossils and other clues to past life or environmental conditions.
A. Astrology B. Genetics C. Geology D. Microevolution E. Paleontology
A rapidly growing population is indicated by
a. A. b. B. c. C. d. D. e. none of these