Antigen-antibody complexes trapped in tissues and triggering complement activation or mast cell degranulation are characteristic of
A) type I hypersensitivity.
B) type II hypersensitivity.
C) type III hypersensitivity.
D) autoimmunity.
E) graft rejection.
C
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The observation that different geographical areas sometimes exhibit plant and animal communities of similar appearance, even though the individual plants and animals are not closely related, is called
A. the fossil record. B. homology. C. convergent evolution. D. divergent evolution. E. adaptation.
At least 150 zoonoses exist worldwide, including which of the following?
a. anthrax b. plague c. polio d. RSV e. rabies f. toxoplasmosis
Which of the following best describes why ionic molecules dissolve and dissociate in water?
A) Water is a polar, covalently bonded substance. B) Water is hydrophobic. C) Water is liquid at room temperature. D) Water is formed from nonpolar covalent bonds between oxygen and hydrogen.
Treponema, Borrelia, and Leptospira are all
A. spirochetes. B. obligate parasites requiring host cells. C. transmitted by arthropod vectors. D. bacteria without cell walls. E. curved rods.