The major obstacle to the use of xenotransplants is _____
a. the lack of human donors
b. finding nonhumans with similar-sized organs
c. resistance from opponents of genetically modified animals
d. organ rejection by recipients
e. the possibility of viral transfer from nonhuman primates to human patients
d
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In this figure, the magnitude of the secondary response is due to ____________________
a. the presence of memory cells b. the presence of antibodies that remain in the body after a first-time infection c. the activity of killer T-cells d. antibodies introduced when someone receives a vaccination
Conservation biology is a ____
a. mature science b. young science c. science that addresses speciation rates d. science practiced by environmentalists e. declining science
When you sit quietly on the couch and read, output from the _____ system prevails
a. sympathetic c. both prevail b. parasympathetic d. neither prevails
Special structures found in seeds that are dispersed by ants are called:a
glyoxisomes. b. elaiosomes. c. peroxisome. d. elatoir. e. lysosome.