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

Biology & Microbiology

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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

Biology & Microbiology

Conservation biology is a ____

a. mature science b. young science c. science that addresses speciation rates d. science practiced by environmentalists e. declining science

Biology & Microbiology

When you sit quietly on the couch and read, output from the _____ system prevails

a. sympathetic c. both prevail b. parasympathetic d. neither prevails

Biology & Microbiology

Special structures found in seeds that are dispersed by ants are called:a

glyoxisomes. b. elaiosomes. c. peroxisome. d. elatoir. e. lysosome.

Biology & Microbiology