Which statement about autoclaving is not right?
A. Pressure is applied to boiling water to prevent the escape of heat in steam ;
B. It is the most efficient sterilization method.
C. Objects sterilized should tolerate moist heat.
D. Killing endospore needs more time than killing bacterial cells.
查看答案
Which molecule is changed to inactivate the cell life in UV light sterilization?
A. DNA ;
B. RNA;
C. DNA polymerase;
D. RNA polymerase
Which wavelength of UV light is most efficient to inactivate the cells life?
A. 300nm;
B. 266 nm ;
C. 380nm;
D. 460nm;
Which statement about UV light sterilization is right?
A. It breaks the disulfide bonds in peptide chain to inactivate proteins function.
B. It induces formation of dimmers of adjacent thymine-thymine in DNA ;
C. It inhibits gyrase activity so that the DNA chain can not be uncoiled .
D. It has much stronger penetration power.
Which pore size of filter membrane is smaller enough to trap most bacterial cells and largest viruses more efficiently?
A. 0.025um
B. 1um;
C. 0.45um ;
D. 0.22um;
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