Exam 11: Physical and Chemical Control of Microbes

Which of the following is not true of glutaraldehyde?

Iodophors include ______.

The method of removing vegetative microbial life forms and debris to reduce contamination to safe levels is termed ______.

Which of the following is not a factor that affects germicidal activity?

A microorganism that is not motile and has stopped metabolizing is considered dead.

Heavy metals work by

Continued widespread use of the phenolic compound triclosan is advantageous in that it is important to remove as many organisms as possible from our hands and there is little risk of resistant organisms evolving.

Chlorine and ethylene oxide are sterilizing gases.

Which of the following types of control agents would be used to achieve sterility?

The removal of all life forms from inanimate objects is termed ______.

_____ radiation excites atoms to a higher energy state within molecules such as DNA, which leads to the formation of pyrimidine dimers.

Which of the following microbial forms has the highest resistance to physical and chemical controls?

Alcohols are more effective at inactivating enveloped viruses than naked viruses.

Ionizing radiation is more effective than nonionizing radiation in killing or inactivating microbes.

Hydrogen peroxide is used in the process of sterilizing instruments such as endoscopes.

All microbicidal agents are sterilants.

Which of the following germicides is/are also sporicidal?

Bacteriostatic agents kill bacterial cells.

All of the following act as surfactants except ______.

Most microbial contaminants of food are killed or inactivated at freezing temperatures.