Explain why modern treatment of a peptic ulcer includes administering an antibacterial agent. Discuss the cause.
What will be an ideal response?
It is now accepted that almost all peptic ulcers are caused by Helicobacter pylori, a slightly helical bacterium that colonizes the stomach. It has numerous virulence factors that allow it to colonize the stomach: a protein to inhibit acid secretion of the stomach; flagella to burrow through the mucous lining of the stomach; adhesins to bind to gastric cells; and enzymes that inhibit phagocytic killing. It also produces urease, which leads to the release of ammonia, which increases the pH of the stomach. Therefore, to kill the pathogen and allow the stomach to heal, physicians treat peptic ulcers with one or more antimicrobial agents in combination with drugs that inhibit acid secretion.
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The donor cell makes ___________ whose function is to bring F- cells close enough to transfer a ___________ to the recipient.
A. a sex pilus, single strand of DNA B. a sex pilus, double strand of DNA C. an F factor, fertility plasmid D. an F factor, replicated F factor E. a sex pilus, bacterial chromosome
Soap should be applied to __________ hands.
gloved clean dry wet
Which of the following plant hormones was discovered in infected rice seedlings that grew extremely tall and slender with "foolish seedling disease"?
A. auxin B. ethylene C. cytokinin D. gibberellins E. abscisic acid
Which of the following groups of organisms are recognized as "retroviruses?"
a) Bacteriophages b) Papillomaviruses c) Herpesviruses d) Adenoviruses e) Human Immunosupression Viruses