Micro Ch. 7

Which of the following methods is used to preserve food by slowing the metabolic processes of food borne microbes?

freezing

Which of the following could be used to sterilize plastic Petri plates in a plastic wrapper?

gamma radiation

Which of the following best describes the pattern of microbial death?

the cells in a population die at a constant rate

Which of the following treatments is the most effective for controlling microbial growth?

they are equivalent treatments

Disinfect used disposable syringes?

throw away, autoclave, ethylene oxide

Which one of the following is most resistant to chemical biocides?

mycobacteria

Bones and tendons for transplant are decontaminated by:

supercritical fluids

Which concentration of ethanol is the most effective bactericide?

70%

In Table 7.1, which compound was the most effective against Staphylococcus? If any:

C

Disinfect tissues taken from patients?

Gamma irradiation, gas sterilization (gas penetrates the tissue)

Disinfect a mattress used by a patient with bubonic plague?

Ultraviolet germicidal radiation (kills fungal cells/spores)

Disinfect intravenous glucose-saline solutions?

autoclave, boil (will kill bacteria)

Which of the following disinfectants acts by disrupting the plasma membrane?

bisphenols

In Table 7.1, which compound was bactericidal? If any:

can't tell

In Table 7.1, which compound was the most effective against E. coli? If any:

can't tell

Which of the following is a limitation of the autoclave?

cannot be used with heat-liable materials

Which of the following substances is used for surgical hand scrubs?

chlorhexidine

An agent used to reduce the number of bacteria on a toilet would most accurately be called a:

disinfectant

An iodophor is a(n):

iodine mixed with a surfactant

Which of the following is the best method to sterilize heat-labile solutions?

membrane filtration

Ethylene oxide is:

sporicidal

Which of the following does NOT achieve sterilization?

pasteurization

Disinfection of water is achieved by all of the following EXCEPT:

peracetic acid

If you were preparing nutrient agar at home and did not have an autoclave, what could you use to sterilize the nutrient agar?

pressure cooker at 121*C for 15 minutes