front 1 Which is the best method to sterilize heat-labile solutions? | back 1 membrane filtration |
front 2 Which best describes the pattern of microbial death? | back 2 The cell in a population die at a constant rate |
front 3 Which chemical agents is used for sterilization | back 3 ethylene oxide |
front 4 Which substances is used for surgical hand scrubs? | back 4 Chlorhexidine |
front 5 Which of the following antimicrobial control agents statement are TRUE | back 5 a) contaminating organic debris such as blood or sputum decrease effectiveness b) some agents kill by denaturing microbial cell proteins c) some agents affect microbial cell membranes by dissolving lipids d) silver is used for treating antibiotic-resistant bacteria |
front 6 Which of the following does achieve sterilization? | back 6 a) dry heat b) autoclave c) supercritical fluids d) ethylene oxide |
front 7 Which of the following does NOT achieve sterilization? | back 7 pasteuralization |
front 8 Which is a limitation of the autoclave? | back 8 It cannot be used with heat-labile materials |
front 9 An agent to reduce bacteria on a toilet would be called | back 9 desinfectant |
front 10 Applying heat to living cells can result in | back 10 a) breaking of hydrogen bonds b) alteration of membrane permeability c) denaturation of enzymes c) damage to nucleic acids |
front 11 Which disinfectants act by disrupting the plasma membrane? | back 11 bisphenols |
front 12 All substances are effective against noenveloped viruses | back 12 a) chlorine b) ethylene oxide d) ozone |
front 13 Which method is used to preserve food ? | back 13 Freezing |
front 14 Which concentration of ethanol (alcohol) is the most effective bactericide? | back 14 70 percent |
front 15 All factors contribute to hospital acquired infection | back 15 a) some bacteria metabolize disinfectants b) gram-negative bacteria are often resistant to disinfectants b) invasive procedures can provide portal of entry for bacteria d) bacteria my be present in commercial products such as mouthwash |
front 16 Which of the treatments are the most effective for controlling microbial growth? | back 16 a) 63o C for 30 min b) 72oC for 15 sec c) 140o C for 4 sec |
front 17 Which method could be used to sterilize plastic Petri plates in a plastic wrapper? | back 17 gamma radiation |
front 18 Which results in lethal damage to nuclei acids? | back 18 a) heat b) radiation c) some chemicals |
front 19 All of the following are effective for destroying PRIONS | back 19 a) incineration b) NaOH + autoclaving at 134oC c) proteases |
front 20 All of the following are methods of food preservation | back 20 a) desiccation b) high pressure c) ionizing radiation d) osmotic pressure |
front 21 If you were preparing nutrient agar at home and did nota have an autoclave, what could you use to sterilize the nutrient agar? | back 21 pressure cooker at 121o C for 15 minutes |
front 22 Which one of the following is most resistant to chemical biocides? | back 22 gram-negative bacteria |
front 23 The thermal death times is the time needed to kill all the bacteria in a particular culture at a certain temperature | back 23 True |
front 24 Moist heat destroys organisms by denaturing proteins | back 24 True |
front 25 The PH of the medium has no affect on the activity of the disinfectant being applied | back 25 False |
front 26 Autoclaving is the most effective method of moist heat sterIlization | back 26 TRUE |