some disease-causing microbes attack the body by turning on or off specific signal transduction pathways. in the disease cholera, the bacterium vibrio cholerae causes massive diarrhea by interfering with such a pathway. a toxin from this bacterium enters intestinal cells and chemically modifies g proteins. once modified, the g proteins can no longer cleave gtp into gdp. what would you expect to see within the intestinal cells of a person with cholera?