题目内容

The cell wall of Gram- bacteria is built up by __ and _.

A. teichoic acid
B. peptidopglycan
C. outer membrane
DAP

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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;

Which enzyme present in the obligate anaerobe can catablize biochemical reaction inthe cells without oxygen?

A. superoxide dismutase ,
B. Catalase
C. peroxidase
D. RNA polymerase,

Which two byproducts of bacterial metabolism in presence of oxygencould kill obligate anaerobe ?

A. H2O2 + O2-
B. CO2+O2
CO2+H2
D. H2+O2