Polysaccharide backbone is linked by two molecules; ______ and ________ alternately.
A. NAG
B. DAP
C. LPS
D. NAM
查看答案
LPS is composed of the following elements
A. Lipid A
B. core polysaccharide
C. teichoic acid
D. specific polysaccharide
The cell wall of Gram- bacteria is built up by __________ and _________.
A. teichoic acid
B. peptidopglycan
C. outer membrane
DAP
Which group do the pathogenic bacteria to human belong to ?
A. Photoautotrophs:
B. Chemoheterotrophs :
C. Photoheterotrophs:
D. Chemoautotrophs:
Which group of bacteria can not grow in the presence of oxygen?
A. Obligate anaerobe;
B. obligate aerobe;
C. Microaerophiles
D. facultative anaerobe;
微信支付 
支付宝支付