题目内容

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

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

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Which one of the following groups do the medical pathogensbelong to ?

A. Psychrophiles;
B. Mesophiles;
C. Thermophiles;
D. Hyperthermophiles.

From which bacteria of the following groups was the DNA polymerase purified to be applied in PCR?

A. Psychrophiles
B. Mesophiles;
C. Thermophiles;
D. Hyperthermophiles;

Which group of molecule can not diffuse across the membrane of bacteria?

A. Oxygen;
B. glucose;
C. carbon dioxide,
D. Alcohol;

What will happen to the bacterial cells in hypertonic solution because of effect of osmosis?

A. No change to the cells;
B. The cells will be swollen;
C. The cells will shrink;
D. The water will move into the cells.

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