The diarrhea associated with enterotoxigenic Escherichia coli (ETEC) is the result of:
A. Plasmid-mediated invasion and destruction of epithelial cells lining colon
B. Mediated by cytotoxic Shiga toxins (STx-1, STx-2), which disrupt protein synthesis
C. Plasmid-c, heat-stable and/or heat-labile enterotoxins that stimulate hypersecretion of fluids and electrolytes
D. Plasmid-mediated A/E histopathology with disruption of normal microvillus structure resulting inmalabsorption and diarrhea
Ans: C. Plasmid-c, heat-stable and/or heat-labile enterotoxins that stimulate hypersecretion of fluids and electrolytes
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a. 25°C b. 56°C c. 72°C d. 94°C
An example of natural active immunity would be
A. chickenpox infection, followed by lifelong immunity. B. chickenpox vaccine triggering extended immunity to chickenpox. C. giving a person immune serum globulins to chickenpox virus after exposure to the disease. D. a fetus acquiring maternal IgG to the chickenpox virus across the placenta.
An example of ex situ conservation is a national park. Indicate whether the statement is true or false
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a. ATP b. mRNA c. DNA d. Protein e. Fat