BMS 127 Ch. 9 Controlling Microbial Growth in the Environment Flashcards
What is a substance which kills microorganisms on laboratory surfaces?
disinfectants
_______ eliminates all organisms and their spores or endospores.
Sterilization
What do you call the disinfecting of cafeteria plates?
sanitization
What is microbial death rate used to measure?
the efficiency of a detergent, antiseptic and sanitization techniques
Which of the following statements is true concerning the selection of an antimicrobial agent?
a. An ideal antimicrobial agent is stable during storage.
b. An ideal antimicrobial agent is fast acting.
c. Ideal microbial agents do not exist
d. all of the above
d. all of the above
The spores of which organism is used as a biological indicator of sterilization?
Bacillus stearnothermophilus
A company that manufactures an antimicrobial cleaner for kitchen counters claims that its product is effective when used in a 50% water solution. By what means might scientists best verify this statement?
a. disk-diffusion test
b. phenol coefficient
c. filter paper test
d. in-use test
d. in-use test
Which of the following items functions most like an autoclave?
a. a boiling pan
b. an incinerator
c. a disiccator
d. a pressure cooker
d. a pressure cooker
Which method of microbial control does beef jerky rely on for preservation?
desiccation
Which of the following types of radiation is more widely used as an antimicrobial technique?
a. electron beams
b. visible light waves
c. radio waves
d. microwaves
a. electron beams
Which of the following would most effectively inhibit anaerobes?
a. phenol
b. silver
c. ethanol
d. hydrogen peroxide
d. hydrogen peroxide
Which of the following adjectives best describes a surgical procedure that is free of microbial contaminants?
a. disinfected
b. sanitized
c. degermed
d. aseptic
d. aseptic
Biosafety Level 3 includes:
a. double sets of entry doors
b. pressurized suits
c. showers in the entryway
d. all of the above
a. double sets of entry doors
A sample of E. coli has been subjected to heat for a specified amount of time, and 90% of the cells have been destroyed. Which of the following terms best describes this event?
a. thermal death point
b. thermal death time
c. decimal reduction time
d. none of the above
c. decimal reduction time
Which of the following substances is least toxic to humans?
a. carbolic acid
b. glutaraldehyde
c. hydrogen peroxide
d. formalin
c. hydrogen peroxide
