Which phylum do roundworms belong to?
A. porifera
B. arthropoda
C. nematoda
D. cnidaria
Answer: C. nematoda
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How do antigen-presenting cells (APCs) acquire the epitopes for presentation?
a. direct infection of the APC b. exocytosis or secretion c. phagocytosis or endocytosis d. diffusion
Four of the five answers listed below are events that can lead to secondary succession. Select the exception
a. a mudslide that destroys a section of a shrubland b. torn down buildings leading to vacant lots c. retreat of a glacier in Alaska d. a fire e. hurricane-damaged coastal marshes
Which primary succession event led to the formation of the tundra?
a. large tsunamis b. glacial retreat c. volcanic activity d. the breaking up of Pangaea e. large earthquakes
One way that substances move between blood and interstitial fluid is by
A) alternatively breaking and regenerating membranes of cells lining capillaries. B) osmosis. C) pressure-driven flow through clefts between the epithelial cells of the capillary wall. D) active transport utilizing ATP.