Infections by Helicopter pylori cause 90% of peptic ulcers in the U.S. These bacteria have pili that are expressed in acidic conditions. A characteristic of this organism is
A. an ability to attach to cells in the host organism's stomach.
B. an ability to move in the direction opposite the pili.
C. an ability to avoid ingestion by cells in the immune system.
D. an ability to induce a large antibody response.
E. an ability to enter the blood stream.
Answer: A. an ability to attach to cells in the host organism's stomach.
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