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
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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。
“青玉谷纹双螭璧”双螭螭首是
A. 双对
B. 双背
“黄玉云纹龙首四耳瓶”出于哪个朝代?
A. 唐
B. 宋
C. 清