The major obstacle to the use of xenotransplants is ________________
A. not enough human donors
B. finding the right sized animals
C. resistance from opponents of genetically modified animals
D. organ rejection by recipients
E. more than one of these
D
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The childhood disease that damages the body defenses and is frequently complicated by secondary infections involving, primarily, Gram-positive cocci is
A. German measles. B. measles. C. mumps. D. chickenpox.
A pine tree is called a sporophyte because it
a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.
Bacteria entering the body through a small cut in the skin _____
A) inactivate the erythrocytes B) stimulate apoptosis of nearby body cells C) stimulate release of interferons D) activate a group of proteins called complement
A reaction that uses the absence of hemolysis of red blood cells to indicate an antigen—antibody reaction is called a(n)
A) agglutination reaction. B) complement fixation. C) immunofluorescence. D) neutralization reaction. E) precipitation reaction.