The ability of some microbes, such as Trypanosoma or Giardia to alter their surface molecules and evade destruction by the host's antibodies is called: A) antigenic variation B) ly... The ability of some microbes, such as Trypanosoma or Giardia to alter their surface molecules and evade destruction by the host's antibodies is called: A) antigenic variation B) lysogenic conversion C) virulence D) cytopathic effect E) cyclopathic effect. Cytopathic effects are changes in host cells due to: A) viral infections B) protozoan infections C) fungal infections D) bacterial infections E) helminthic infections. Superantigens produce intense immune responses by stimulating lymphocytes to produce: A) endotoxins B) exotoxins C) cytokines D) leukocidins E) pyrogenic superantigens. Bacteria such as E. coli and Salmonella produce invasins that bind host cells, thus causing the cells to: A) release TNF B) produce iron-binding proteins C) engulf the bacteria D) destroy the bacteria E) release cytokines. A commensal bacterium A) does not receive any benefit from its host B) is beneficial to its host C) may also be an opportunistic pathogen D) isn't capable of causing disease in its host E) always causes disease in its host. Which of the following statements is TRUE? A) Both members are harmed in a symbiotic relationship. Read more