超星 - Quiz of lecture 5 - 查题吧

单选题

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.

单选题

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;

单选题

Which type of alcohol is more effective to kill bacteria?

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

单选题

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

单选题

Which type of the halogens is used in toothpaste to prevent dental caries?

A. iodine,
B. chlorine,
C. bromine,
D. fluorine.

单选题

Which of the following disinfectants is used to kill anaerobes in deep puncturewounds?

A. iodine,
B. ethylene oxide,
C. Oxidizing agents,
D. 75% alcohol

单选题

Which level of Biosafety is the most secure , allowing work with dangerous microbes that cause severe or fatal diseases in humans, such as Ebola?

A. Biosafety Level –1;
Biosafety Level --2
C. Biosafety Level –3;
D. Biosafety Level --4

判断题

A sterile object is one free of all microbial forms, but bacterial spores can be present.

A. 对
B. 错

判断题

Sterilization is a process of destroying all microbial forms.

A. 对
B. 错

判断题

Disinfection is a process to reduce or eliminate pathogenic microorganisms in or on material.

A. 对
B. 错

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