Microbial Control Methods and Factors
30 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of biosafety levels in laboratories?

  • To determine the temperature at which microbes die
  • To specify the color-coding of lab equipment
  • To categorize laboratory practices, safety equipment, and facility construction controls required for handling pathogens (correct)
  • To classify different microbes based on their level of hazard
  • In biosafety level 3 (BSL-3), what is the key requirement for handling microbes?

  • Isolation of lab space
  • Wearing protective suits
  • Use of safety cabinets (correct)
  • Handling moderately hazardous agents
  • What is the primary effect of high temperatures on microbes?

  • Promote nucleic acid replication
  • Enhance cell wall structure
  • Strengthen cytoplasmic membranes
  • Denature proteins (correct)
  • What is the significance of Thermal Death Point (TDP) in microbial control?

    <p>The minimum temperature needed to kill all cells in a culture in 10 minutes</p> Signup and view all the answers

    What is the primary purpose of using high pressure as a method of microbial control?

    <p>To disrupt cell structures and functions</p> Signup and view all the answers

    What is the main function of desiccation in microbial control?

    <p>To remove water from microbes, inhibiting their growth</p> Signup and view all the answers

    What type of radiation is described as high-speed subatomic particles freed from their atoms?

    <p>Particulate radiation</p> Signup and view all the answers

    Which type of radiation damages DNA by ionizing water to release OH?

    <p>Ionizing radiation</p> Signup and view all the answers

    What type of radiation damages DNA and is specifically mentioned as not being especially antimicrobial when using microwaves?

    <p>Nonionizing radiation</p> Signup and view all the answers

    Which of the following is NOT mentioned as a principle affecting the effectiveness of chemical methods of microbial control?

    <p>Solubility of the disinfectant</p> Signup and view all the answers

    What is the main setback of using Phenol (Carbolic Acid) as a disinfectant?

    <p>It has an unpleasant odor</p> Signup and view all the answers

    Which type of microbial cell component is disrupted by Phenolics as a part of their mechanism of action?

    <p>Cell wall</p> Signup and view all the answers

    What is the primary reason for halting protein synthesis through action on RNA?

    <p>To prevent microbial growth</p> Signup and view all the answers

    Which of the following is NOT an ideal characteristic of a microbial control agent?

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

    What is the primary purpose of using high-level germicides?

    <p>To kill all pathogens, including endospores</p> Signup and view all the answers

    Which characteristic does NOT affect the efficacy of antimicrobial methods?

    <p>Method of microbial control based on site of medical procedure</p> Signup and view all the answers

    What is the primary goal of applying biosafety precautions?

    <p>To reduce the risk of exposure to infectious organisms</p> Signup and view all the answers

    What is the function of low-level germicides?

    <p>Kill vegetative bacteria, fungi, protozoa, and some viruses</p> Signup and view all the answers

    What is the recommended optimum concentration of ethanol for killing bacteria and fungi?

    <p>70%</p> Signup and view all the answers

    Why is pure ethanol (100%) less effective than 70% ethanol for microbial denaturation?

    <p>It lacks water to aid in denaturation</p> Signup and view all the answers

    How do quaternary ammonium compounds (Quats) primarily affect bacterial cells?

    <p>Enhance cell permeability</p> Signup and view all the answers

    What is one limitation of using hydrogen peroxide to treat open wounds?

    <p>It has catalase activity</p> Signup and view all the answers

    How do surface-active agents (surfactants) primarily assist in removing microorganisms?

    <p>By decreasing surface tension</p> Signup and view all the answers

    Which alcohol is slightly superior to ethanol due to being less volatile and less expensive?

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

    Which heavy metal is commonly used as a topical cream on burns?

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

    What is the primary mechanism of action for organic acid food preservatives?

    <p>Inhibit metabolism</p> Signup and view all the answers

    Which heavy metal compound is used as an algicide?

    <p>Copper sulfate</p> Signup and view all the answers

    What is the primary mechanism of action for antibiotics used as food preservatives?

    <p>Prevent spoilage of cheese</p> Signup and view all the answers

    Which heavy metal compound is used to prevent gonorrheal ophthalmia neonatorum?

    <p>Silver nitrate</p> Signup and view all the answers

    Which heavy metal compound contains both mercury and sodium?

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

    More Like This

    Microbial Control Methods and Sterilization
    51 questions
    Microbial Control Methods Overview
    53 questions
    Microbial Control Methods
    74 questions
    Use Quizgecko on...
    Browser
    Browser