Physical and Chemical Agents Which of the following describes the effect of ionizing radiation on microbes? Induces electrons and protons to jump out of the molecules of the microbe Substantially decreases enzymatic activity, slowing microbial reproduction Changes the 3-dimensional structure of proteins to a 2-dimen-sional form None of these Induces electrons and protons to jump out of the molecules of the microbe Substantially decreases enzymatic activity, slowing microbial reproduction Changes the 3-dimensional structure of proteins to a 2-dimen-sional form None of these ANSWER DOWNLOAD EXAMIANS APP
Physical and Chemical Agents Which of the following skin disinfectant(s) is/are most frequently used? Ethyl alcohol Both (a) and (b) Isopropyl alcohol none of these Ethyl alcohol Both (a) and (b) Isopropyl alcohol none of these ANSWER DOWNLOAD EXAMIANS APP
Physical and Chemical Agents One drawback to the use of ultraviolet light as a sterilizing agent is its failure to bacterial spores failure to kill microbes in a closed environment failure to kill microbes located in the center of an object failure to kill bacteria failure to bacterial spores failure to kill microbes in a closed environment failure to kill microbes located in the center of an object failure to kill bacteria ANSWER DOWNLOAD EXAMIANS APP
Physical and Chemical Agents Which of the following is best used for long term storage of microbial samples when carried out properly? Storage in a refrigerator on an agar slant Storage in a freezer at ultra low temperatures (-70°C) Storage on a petri plate at room temperature Storage in a freezer at -10°C Storage in a refrigerator on an agar slant Storage in a freezer at ultra low temperatures (-70°C) Storage on a petri plate at room temperature Storage in a freezer at -10°C ANSWER DOWNLOAD EXAMIANS APP
Physical and Chemical Agents If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound? 5 1 50 10 5 1 50 10 ANSWER DOWNLOAD EXAMIANS APP
Physical and Chemical Agents Which is the most important surface active disinfectants? Amphoteric compounds Cationic compounds Non-ionic compounds Anionic compounds Amphoteric compounds Cationic compounds Non-ionic compounds Anionic compounds ANSWER DOWNLOAD EXAMIANS APP
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