Which bacteria is able to ferment lactose slowly? ()
A. Shigella dysenteriae
B. Shigella sonnei
C. Shigella boydii
D. Shigella flexneri
E. mutation of shigella flexneri
查看答案
Clostridum belong to ()
A. gram-negative cocci
B. gram-positive cocci
C. gram-positive bacilli, no spore forming;
D. gram positive bacilli,spore forming
E. gram negative bacilli,spore forming
Which type of nucleic acid can act as mRNA and code for all the protein required during replication? ()
A. dsDNA
B. dsRNA
C. –ssRNA
D. +ssRNA
E. ssDNA
Which of the following is found within the nuclei of infected hepatocytes and not usually in the peripheral circulation? () A
A. HbsAg
B. HbcAg
C. anti-HBc
D. HbeAb
Which of the following statements is wrong about HAV virus? ()
A. +ssRNA virus
B. Can be cultivated in cell
C. Bing spread by the fecal-oral route
D. Never lead to chronic disease
E. anti-HAV IgG is the earliest diagnositic evidence
微信支付 
支付宝支付