题目内容

Which wavelength of UV light is most efficient to inactivate the cells life?

A. 300nm;
B. 266 nm ;
C. 380nm;
D. 460nm;

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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.

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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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Which type of alcohol is more effective to kill bacteria?

A. 80%;
B. 95%
C. 70% ;
D. 100%;

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Which one of the following chemicals was used by Dr. Joseph Lister to reduceinfection during surgery in 1867 ?

A. surfactants,
B. heavy metals,
C. phenol ,
D. alcohol

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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?

Which pore size of filter membrane is smaller enough to trap most bacterial cells and largest viruses more efficiently?

Which type of alcohol is more effective to kill bacteria?

Which one of the following chemicals was used by Dr. Joseph Lister to reduceinfection during surgery in 1867 ?

A. 300nm;
B. 266 nm ;
C. 380nm;
D. 460nm;