Microbiology by Bauman Chapter 9 Q & A
In-use test
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 scientist best verify this statement?
Decimal reduction time
A sample of E. coli has been subjected to heat for a specified time, and 90% of the cells have been destroyed. Which of the following terms best describes this event?
Double sets of entry doors
Biosafety Level 3 includes ___________.
Sterilization eliminates organisms and their spores or endospores.
In practical terms in everyday use, which of the following statements provides the definition of sterilization?
Bacillus stearothermophilus
The endospores of which organism can be used as a biological indicator of sterilization?
Detergent, antiseptic, and sanitization techniques
The microbial death rate is used to measure the efficiency of ___________________.
Desiccation
The preservation of beef jerky from microbial growth relies on which method of microbial control?
Ethylene oxide
Which antimicrobial chemical has been used to sterilize spacecraft?
Quaternary ammonium compounds
Which class of surfactant is most soluble in water?
Aseptic
Which of the following adjectives best describes a surgical procedure that is free of microbial contaminants?
Ethylene oxide
Which of the following chemicals is active against bacterial endospores?
Phenol
Which of the following disinfectants acts against cell membranes?
Tincture of bromine
Which of the following disinfectants contains alcohol?
Pressure cooker
Which of the following items functions most like an autoclave?
An ideal antimicrobial agent is stable during storage. An ideal antimicrobial agent is fast acting. Ideal microbial agents do not exist.
Which of the following statements is true concerning the selection of antimicrobial agent?
Hydrogen peroxide
Which of the following substances is least toxic to humans?
Disinfectants
Which of the following substances or processes kills microorganisms on laboratory surfaces?
Hydrogen peroxide
Which of the following substances would most effectively inhibit anaerobes?
Sanitization
Which of the following terms best describes the disinfecting of cafeteria plates?
Electron beams
Which of the following types of radiation is more widely used as an antimicrobial technique?