Which of the following is an example of a type I hypersensitivity reaction?
A. watery eyes after exposure to animals
B. destruction of red blood cells after an incompatible blood transfusion
C. farmer's lung
D. immune complexes accumulation in the kidneys
E. the tuberculin response
Answer: A
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Multilocus sequence typing involves sequencing several different
A) genomes. B) housekeeping genes. C) tRNA genes. D) rRNA genes.
Genetic recombination ____
a. occurs in eukaryotes but not prokaryotes b. involves exchange between non-homologous regions of DNA c. results from asexual reproduction
d. decreases genetic diversity e. can occur in the absence of meiosis
Cancer may arise as a result of
A) mutations associated with viral infection. B) mutations associated with chemical mutagens. C) mutations associated with radiation. D) spontaneous mutations. E) All of these
How is the development of autoimmunity normally prevented?
A) T lymphocytes that respond to autoantigens in the thymus undergo clonal deletion. B) T lymphocytes require a specific set of cytokine signals to become activated. C) Regulatory T cells suppress autoimmune responses. D) Clonal deletion of T cells and regulatory T cell suppression prevent autoreactive T cell activation. E) Clonal deletion of T cells, lack of necessary cytokine signals, and regulatory T cell suppression prevent activation of autoreactive T cells.