Vaccines using inactivated pathogens do not stimulate cell-mediated immunity as effectively as vaccines using attenuated pathogens.
Answer the following statement true (T) or false (F)
True
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Changes in allelic frequencies due to genetic drift are
a. random and unpredictable b. nonrandom and predictable c. uniform from generation to generation
If you found a mutation, involving the loss of two bases, which was present in humans living on all four continents which you could test but was absent in close relatives such as gorillas and chimps, what would this imply?
A. Two bases were actually insertions in the nonhuman primates. B. Deletion arose before the branch between humans and nonhuman primates. C. Deletion arose in multiple nonhuman primates. D. Deletion arose at least six times in different human populations. E. Deletion arose after the branch between humans and nonhuman primates.
Each amino acid is encoded by only one mRNA codon
a. True b. False
B cells:a
are produced in the adult spleen. b. lyse bacterial cell walls by secreting digestive enzymes. c. can become plasma cells, which produce interleukins. d. undergo clonal reproduction once activated. e. stimulate apoptosis.