Which of the following infectious agents is least resistant to destruction by chemical methods?
A stationary broth culture contains 10 billion (1010 )cells. the microbial death rate during autoclaving of this spent culture is 1.5 minutes. How long must it be autoclaved to be considered sterile?
An instrument that will come into contact with only the skin of a patient should be disinfected with a
Boiling water for 10 minutes is effective in ridding it of
Which of the following is NOT a feature associated with filtration?
Which of the following types of radiation is non ionizing and has the shortest wavelength?
Silvadene, a topical treatment for burns, contains 1% silver. What category of chemical control agent is in Silvadene?
Which of the following is the most appropriate pairing of microbe and biosafety level?
The use of lysozyme during the preparation of cheeses and wines is effective in reducing the numbers of
Which of the following statements about quaternary ammonium compounds is FALSE:
Which of the following was used in the past to prevent the transmission of gonorrhea from an infected mother to her newborn?
Which of the following is used to sterilize items that should not, or cannot, be exposed to heat or water?
Which of the following statements about aldehydes is FALSE?
Which of the following is NOT a desirable characteristic of an ideal antimicrobial agent?
The endospores of which of the following microbes are used to measure the effectiveness of autoclave sterilization?
A scientist develops a new medication that is a protein compound and that must be administered by injection. Which of the following would be the most effective and safest means of preparing a sterile solution of the new medication?
Which of the following procedures is currently the standard test used in the United States for evaluating the efficiency of antiseptics and disinfectants?
The process of freeze-drying microbes to preserve them is (lyophilization/dessication)
Natural antiseptics such as pine or clove oil are examples of antimicrobial compounds called (alcohols/ phenolics/ detergents).
An (iodophor/ halogen) is an iodine-containing organic compound found in such antiseptics as Betadine.
Disinfectants known as (alcohols/ oxidizers/ aldehydes) have the chemical group-CHO, which reacts with and damages both proteins and nucleic acids.
The lowest temperature that kills all cells in a broth in 10 minutes is known as the (microbial/ thermal) death point.
The amount of time needed to sterilize materials using moist heat is (more/less) than the time needed to sterilize using dry heat.
Microbial growth in jellies is inhibited by the ( acidic/ hypotonic/ hypertonic) condition of the food.
The deadliest, most contagious microbes are studied under conditions of (BSL-4/ BSL-3/ BSL-2/ BSL-1) containment.
The antimicrobial chemical pictured above is a (phenolic/ surfactant/ enzyme) compound found in many consumer products.
Elements such as iodine, chlorine, and bromine are examples of (oxidizers/ halogens/ metals), which are the basis for many effective antimicrobial agents.
Heavy metal and oxidizing agent disinfectants damage (proteins/ DNA/ membranes), interfering with microbial metabolism.
The (endospore/ cysts/ prions) are the infectious agents most resistant to antimicrobial agents or processes.
The process of heating milk or fruit juice to levels that kill any pathogenic microbes present is known as (pasteurization/ sanitization/ lyophilization).