Cytotoxic T-cells produce _______.
A. perforin, which makes holes in cell membrane of infected cells
B. antibodies, which make holes in cell membrane of infected cells
C. interferon which attacks viral-infected cell
D. class II MHC which present antigens
A. perforin, which makes holes in cell membrane of infected cells
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The initial stages of the inflammatory response are characterized by
A. the release of cytokines. B. vasodilation. C. leukocyte movement through the capillary wall. D. the release of nitric oxide from endothelial cells. E. All of these statements are correct.
Collectively, the amygdala, olfactory bulbs, hippocampus, and parts of the thalamus and hypothalamus are said to form
A. the limbic system. B. the reticular formation. C. the basal nuclei. D. the sympathetic division. E. the frontal lobe.
Which pinniped can use its hind limbs to walk on land?
a. Guadalupe fur seal b. Steller's sea lion c. leopard seal d. elephant seal e. harbor seal
In addition to its white coloration, beluga whales possess another unique characteristic which is: a. the ability to forage in groups
b. the ability to bend its neck. c. the formation of a tusk d. the presence of two teeth.