Which of the following methods can destroy all microbial forms including endospores most efficiently?
A. boiling water;
B. autoclave;
C. pasteurization;
D. 75% alcohol
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Which of the following parameters is right in hot air sterilization?
A. 160 ℃ /2hrs ;
B. 160℃/1hrs ;
C. 120℃/1hrs;
D. 100℃/2hrs;
Which of the following parameters is right in autoclaving sterilization?
A. 111.3℃, 1.05kg/cm2, 15-20min, ;
B. 160℃,1.05kg/cm2,15-20min,
C. 120 ℃, 1.05kg/cm2, 1hrs;
D. 121.3℃,1.05kg/cm2,15-20min,
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.
Which molecule is changed to inactivate the cell life in UV light sterilization?
A. DNA ;
B. RNA;
C. DNA polymerase;
D. RNA polymerase
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