Explain how Vibrio cholerae causes cholera without apparent damage to the intestinal epithelium
A. This microbe causes destruction of the cellular structures underneath the intestinal epithelium-this is what induces the watery rice-stool characteristic of the illness. This leaves the overlying intestinal epithelium intact.
B. This microbe directly invades the intestinal epithelial cells, but does not kill them. Instead, while multiplying inside them, it causes them to secrete large amounts of chloride ions. This induces water to follow by osmosis, resulting in the watery rice-stool characteristic of the illness.
C. This microbe attaches to the surface of intestinal epithelial cells, secreting an exotoxin that causes the epithelium to secrete large amounts of chloride ions. This induces large amounts of water to follow by osmosis, resulting in the watery rice-stool characteristic of the illness.
D. The inflammatory reaction to the presence of this microbe causes the watery rice-stool characteristic of the illness. Therefore, it's technically the immune response that initiates the disease, although this response is induced by the presence of the microbe on the intestinal epithelium.
C.
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Cells were first discovered in the
__________century. a. 14th b. 15th c. 16th d. 17th e. 18th
Part of a chromosome moves to another, nonhomologous chromosome during ____________________.Fill in the blank(s) with the appropriate word(s)
Which group belongs to the Chromalveolates?
a. diatoms b. apicomplexans c. chlorophyta d. rhodophyta
Members of the Domain Bacteria and Domain Archaea differ in that
A. Archaea are larger than Bacteria. B. Archaea reproduce sexually and Bacteria do not. C. Archaea are mostly parasitic. D. Archaea have a more complex nature to their DNA than do Bacteria.