Chemical Agents in Microbial Control Quiz
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Questions and Answers

Which of the following statements about halogens is NOT correct?

  • Halogens are not effective components of disinfectants and antiseptics. (correct)
  • Halogens are a group of nonmetallic elements with similar chemical properties.
  • Halogens are microbicidal and not just microbistatic.
  • Halogens include fluorine, bromine, chlorine, and iodine.

    • What is the primary mode of action of chlorine in microbial control?

  • Chlorine kills almost all microorganisms, including endospores, within 30 minutes.
  • Chlorine damages the structure of DNA, RNA, and fatty acids. (correct)
  • Chlorine compounds are highly stable and effective even in the presence of light, alkaline pH, and organic matter.
  • Chlorine penetrates the cells of microorganisms.

    • Which of the following statements about the use of iodine as a chemical agent is correct?

  • Iodine is less effective than chlorine and can only kill certain classes of microorganisms.
  • Iodine's mode of action is different from that of chlorine, as it is less susceptible to inactivation by organic material.
  • Iodine is a colorless element that forms a clear solution when dissolved in water.
  • Iodine is a pungent blue-black element that forms a brown-colored solution when dissolved in water. (correct)

    • What is the main reason for the decreased effectiveness of chlorine compounds in microbial control?

    <p>Chlorine compounds are inactivated by the presence of light, alkaline pH, and excess organic matter.</p> Signup and view all the answers

    Which of the following statements about the effectiveness of iodine as a chemical agent is correct?

    <p>Iodine is as effective as chlorine, but its mode of action is different and it is less susceptible to inactivation by organic material.</p> Signup and view all the answers

    What is the key difference between the effectiveness of chlorine and iodine as chemical agents for microbial control?

    <p>Chlorine is more susceptible to inactivation by organic matter, while iodine is more stable.</p> Signup and view all the answers

    When did the chemical control of microbes likely emerge as a serious science?

    <p>In the early 19th century</p> Signup and view all the answers

    How many different antimicrobial chemical agents are currently manufactured?

    <p>Approximately 10,000</p> Signup and view all the answers

    Which of the following is NOT a desirable property when choosing a microbicidal chemical?

    <p>Tendency to become inactivated by organic matter</p> Signup and view all the answers

    What is the purpose of a deodorizing chemical agent in microbial control?

    <p>To remove unpleasant odors caused by microbes</p> Signup and view all the answers

    Which of the following is NOT mentioned as a form in which chemical agents for microbial control can exist?

    <p>Powder</p> Signup and view all the answers

    What is the total number of levels of chemical decontamination procedures mentioned?

    <p>3</p> Signup and view all the answers

    What is the primary mechanism of action for aldehydes like glutaraldehyde?

    <p>Disrupting enzyme activity by replacing hydrogen atoms on amino acids</p> Signup and view all the answers

    What is the sporicidal activity of hydrogen peroxide?

    <p>Hydrogen peroxide is sporicidal in higher concentrations.</p> Signup and view all the answers

    What is the primary use of isopropyl alcohol mentioned in the text?

    <p>Disinfection of objects and surfaces</p> Signup and view all the answers

    Which of the following is NOT a property of hydrogen peroxide mentioned in the text?

    <p>Bactericidal, virucidal, and fungicidal</p> Signup and view all the answers

    What is the primary mechanism of action for aldehydes like glutaraldehyde?

    <p>Disrupting enzyme activity by replacing hydrogen atoms on amino acids</p> Signup and view all the answers

    Which of the following is a characteristic of aldehydes like glutaraldehyde?

    <p>They can inactivate viruses after relatively short exposure</p> Signup and view all the answers

    Which of the following statements is true about high-level germicides?

    <p>They kill all types of microorganisms, including endospores.</p> Signup and view all the answers

    What is the primary function of intermediate-level germicides?

    <p>To disinfect non-invasive equipment that comes into contact with mucous membranes.</p> Signup and view all the answers

    Which of the following is NOT a factor that affects the germicidal activities of chemical agents?

    <p>The temperature at which the agent is used.</p> Signup and view all the answers

    What is the purpose of low-level disinfectants?

    <p>To eliminate vegetative bacteria, fungal cells, and some viruses.</p> Signup and view all the answers

    Which of the following statements about the germicidal activities of chemical agents is true?

    <p>Adequate contact time is important for the chemical to penetrate and act on microbes.</p> Signup and view all the answers

    Which of the following statements is true regarding the use of chemical agents for decontamination?

    <p>The choice of chemical agent depends on the level of decontamination required.</p> Signup and view all the answers

    What is one of the main advantages of using gaseous sterilants and disinfectants?

    <p>They are more effective than heat or liquid chemicals.</p> Signup and view all the answers

    What is one of the major disadvantages of using ethylene oxide as a sterilant?

    <p>It is explosive and dangerous to handle.</p> Signup and view all the answers

    What is the main reason why soaps alone are considered weak microbicides?

    <p>They are not effective against common hospital pathogens like Pseudomonas.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of detergents and soaps as chemical agents?

    <p>They are effective at destroying highly sensitive forms of bacteria.</p> Signup and view all the answers

    What is the main reason why ethylene oxide is considered a carcinogen?

    <p>It can damage the lungs, eyes, and mucous membranes if contacted directly.</p> Signup and view all the answers

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