Which of the following can be defined as small proteins that are secreted from virally infected cells to prevent the spread of the infection?
A) interferons B) macrophages C) immunoglobulins D) mast cells
Answer: A
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Clonal selection is an explanation for how _____
A) a single type of stem cell can produce both red blood cells and white blood cells B) V, J, and C gene segments are rearranged C) an antigen can provoke production of high levels of specific antibodies D) HIV (human immunodeficiency virus) can disrupt the immune system E) macrophages can recognize specific T cells and B cells
In the taxonomic hierarchy, a family consists of a group of similar
a. orders. b. classes. c. species. d. genera. e. domains.
During gastrulation, three tissue layers form: the outer __________, the inner __________, and the __________ in
between the first two layers. Fill in the blank(s) with the appropriate word(s).
A _________ relationship is one in which two or more kinds of organisms live together in often elaborate and more or less permanent association.
A. symbiotic B. parasitic C. mutualistic D. synergistic