front 1 Sterilization is the: | back 1 Destruction of all forms of microbial life. |
front 2 An antiseptic is used when one needs to remove microbes from: | back 2 Skin, prior to injection |
front 3 Foods to be canned need not be sterile. However, all of Clostridium botulinum must be killed. | back 3 Enodpores |
front 4 Some antimicrobial treatments kill microbes; some inhibit growth. Which term refers to an agent that inhibits bacterial growth? | back 4 Bacteriostatic. |
front 5 Which of the following is not a major target for action of antimicrobials? | back 5 Flagella |
front 6 Decimal reduction time is the time in minutes in which of the population at a given temperature will be killed. | back 6 90% |
front 7 Which is not a characteristic of the autoclave? | back 7 The requirement for long (hours) exposure times |
front 8 Milk that you have never opened spoils in the refrigerator. A sample reveals the presence of microorganisms. The most likely explanation is: | back 8 The microbes that survived pasteurization were able to grow at 4 °C. |
front 9 Choose the best method for the sterilization of an enzyme solution. A) Freezing. B) Dry heat. C) Filtration. D)Treatment with phenol. E)Autoclave. | back 9 Filtration |
front 10 The bactericidal effect of UV light is attributed to damage to: | back 10 DNA |
front 11 Some microbes are very resistant to antimicrobial chemicals. Which of the following would be the easiest to kill? A)Pseudomonas aeruginosa B) Mycobacterium tuberculosis C) E. coli D) cysts of Protozoa E) Clostridium endospores | back 11 E. Coli |
front 12 In the filter paper method used for evaluation of antimicrobial chemicals, the effectiveness of a chemical is indicated by a around a disc immersed with the test chemical. | back 12 Clear Zone |
front 13 The first disinfectant used by Lister was | back 13 Phenol |
front 14 Alcohol is most effective when used as a solution. | back 14 70% |
front 15 Which chemical was once used to treat the eyes of newborn babies to kill N. Gonorrhoeae? | back 15 Silver Nitrate |
front 16 The following may be listed on the ingredients of your favorite snack food. Which of the following is not antimicrobial? A) Potassium sorbate. B) Calcium propionate. C) Sodium benzoate. D) Xanthan. E) Sorbic acid. | back 16 Xanthan |
front 17 The more microbes present in a sample, the ____________________ it takes to eliminate the microbial population. | back 17 Longer |
front 18 The ____________________ is the lowest temperature at which all microorganisms in a liquid suspension will be killed in 10 minutes. | back 18 Thermal Death Point |
front 19 Dry heat kills by ____________________ , similar to the slow charring of paper in a heated oven. | back 19 Oxidation |
front 20 ____________________ is a common household disinfectant that has been used to disinfectant everything from dairies to drinking water. | back 20 Bleach |
front 21 A zone of growth inhibition around a copper penny on a plate that had been swabbed with bacteria demonstrates the ____________________ of copper | back 21 oligodynamic action |
front 22 ____________________ has little value as an antiseptic but is important in the mechanical removal of microbes. | back 22 Soap |
front 23 Oxidizing agents are useful for irrigating deep wounds where released oxygen will inhibit the growth of ____________________ . | back 23 anaerobic bacteria |
front 24 __________________ can grow in solutions of quaternary ammonium compounds | back 24 Pseudomonas |
front 25 ____________ are commonly used as food preservatives in spite of their conversion to the carcinogenic products called nitrosamines. | back 25 Nitrates |
front 26 _______ ammonia compounds are less effective against gram-negative bacteria and more effective against gram-positive bacteria. | back 26 Quaternary |
front 27 Microbes vary with respect to sensitivity to an antimicrobial agent. | back 27 True |
front 28 The presence of organic matter, such as blood or saliva, speeds the action of antimicrobial chemicals. | back 28 False |
front 29 Times required for sterilization in an autoclave are shorter than those required in a dry oven because moist heat penetrates biological specimens more effectively than does dry heat. | back 29 True |
front 30 Aldehydes, alcohols, and halogens kill bacteria by the same method of action | back 30 False |
front 31 UV radiation and X ray radiation are similar in that they damage DNA and have a high penetrating power. | back 31 False |
front 32 Soap is ineffective in killing bacteria. Therefore, hand washing is a rather ineffective measure in preventing disease transmission. | back 32 False |
front 33 70% ethyl alcohol is a more effective bactericide than 100% alcohol. | back 33 True |