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BIOS 280 Exam 2; Questions and Answers Rated A+
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BIOS 280 Exam 2; Questions and Answers Rated A+
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BIOS 280 Exam 2; Questions and Answers Rated A+heating to a temp below boiling to kill specific pathogens and increase shelf-time Correct
Ans-pasteurization
salmonella, listeria, mycobacterium, campylobacter, brucella Correct Ans-primary
pathogen targets of pasteurization
autoclaving is a ____ heat method Correct Ans-moist
if____ is increased, higher temps. can be reached Correct Ans-pressure
121 degrees C at 15 PSI Correct Ans-common setting of autoclave
___ min at common autoclave setting is very effective Correct Ans-15
type of radiation that knocks electrons off atoms Correct Ans-ionizing
, BIOS 280 Exam 2; Questions and Answers Rated A+
type of radiation that damages DNA and proteins by breaking bonds Correct Ans-ionizing
exposure to this type of radiation is a hazard to humans Correct Ans-ionizing
type of radiation that penetrates solids and liquids and is used in fruits, vegetables, and now
meats Correct Ans-ionizing
type of radiation that excites atoms but doesn't ionize them Correct Ans-non-ionizing
ex. UV light, sunlight Correct Ans-non-ionizing
ex. gamma rays and x-rays Correct Ans-ionizing
damages DNA by creating T-T dimers Correct Ans-non-ionizing
relatively safe to use, doesn't penetrate solids or liquids well, surface sterilization and water
treatment Correct Ans-non-ionizing radiation
, BIOS 280 Exam 2; Questions and Answers Rated A+
autoclave, an oven at high heat, gamma
Solution containing antibiotic - filtration Correct Ans-sterilization of a scalpel
disruption using sound waves Correct Ans-sonication
many _____ control agents function by disrupting membranes, and altering protein and/or
nucleic acid structure Correct Ans-chemical
effectiveness of chemical control agents is determined by... Correct Ans-concentration,
contact time
type of phenol that is in lysol Correct Ans-p-cresol
_____affect protein function and/or disrupt membranes Correct Ans-phenolics
mainly chlorine, also iodine and flourine, effective against bacteria, fungi, spores, viruses.
Ineffective at alkaline pH Correct Ans-halogens
, BIOS 280 Exam 2; Questions and Answers Rated A+
destroy cell membranes, can coagulate proteins because it dehydrates them Correct Ans-
alcohols
_____alcohol is more microbicidal but also more toxic Correct Ans-isopropanol
70-95% alcohol Correct Ans-ethanol
forms oxygen free radicals which are toxic to all cells. Correct Ans-hydrogen peroxide
Also breaks down to H2O and O2 therefore is strongly effective against anaerobes Correct
Ans-hydrogen peroxide
All solubilize membranes and disrupt proteins Correct Ans-detergents
____ detergents (like soaps) are not very microbicidal, although they may be very effective in
sanitization Correct Ans-non-ionic
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