题目内容

Vibrio cholera attaching to intestinal surface is due to

A. Flagella
B. LTA
C. Pili
D. K antigen

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Cholera is toxicogenic disease common in many parts of the world. In the treatment of patients who have cholera, the use of a drug that inhibits adenyl cyclase would be expected to

A. kill the patient immediately
B. eradiate the organism
C. increase fluid secretion
D. block the action of cholera toxin

An experimental compound is discovered that prevents the activation of adenyl cyclase and the resulting increase in cyclic AMP. The toxic effects of which of the following bacteria might be prevented with the use of this experimental compound?

A. Vibrio cholerae
B. Corynebacterium diphtheriae
C. Pseudomonas
D. Listeria monocytogenes

The DNA coding for the production of cholera toxin in Vibrio cholerae is on the

A. phage
B. plasmid
C. chromosome
D. transposon

求曲线y=lnx在点（e,1）处的切线与y轴的交点。