The exfoliative toxins, TSST-1, and the enterotoxins are all superantigens. The genes for these toxins are A: Present in all strains of Staphylococcus aureus B: Widely distributed on the staphylococcal chromosome C: On both the staphylococcal chromosome (TSST-1 and exfoliative toxins) and on plasmids (enterotoxins) D: On the staphylococcal chromosome in a pathogenicity island E: On plasmids

A DNA library is[u]      [/u] A: An international storehouse of all DNA data that has been collected to date B: All the plasmids in a bacteria C: All the genes in a bacteria D: A collection of cloned DNA pieces

The pathogenic characteristics of enterotoxigenic Escherichia coli shall be excluded: A: Adhesion to the epithelial cells of the upper intestinal mucosa B: Production of heat and / or heat labile enterotoxins C: Toxicity can be transmitted to other E.coli through plasmids D: Enterotoxin causes severe damage to mucous membrane

A DNA library is… A: An international storehouse of all DNA data that has been collected to date B: The entire genetic code of human beings from the human genome project C: All the plasmids in a bacteria D: All the genes in a bacteria E: A collection of cloned DNA pieces