Microbiology: Media and Microbial Growth Control
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Questions and Answers

Which type of heat treatment is preferred for moisture-sensitive materials?

  • Tyndallization
  • Autoclaving
  • Moist Heat
  • Dry Heat (correct)

    • What is the primary purpose of sterilization in a microbial growth control context?

  • To lower microbial counts to safe public health levels
  • To mechanically remove microbes from a limited area
  • To inhibit or kill other microorganisms using antibiotics
  • To completely destroy all forms of microbial life, including endospores (correct)

    • What is the primary purpose of pasteurization in food processing?

  • To destroy vegetative pathogens on inanimate surfaces
  • To lower microbial counts to safe public health levels (correct)
  • To kill endospores of Clostridium botulinum in canned foods
  • To destroy vegetative pathogens on living tissue

    • What is the term for the destruction of vegetative pathogens on living tissue?

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

    What is the term for the mechanical removal of microbes from a limited area?

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

    What is the term for the application of treatment intended to lower microbial counts to safe public health levels?

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

    What is the primary purpose of Selective Media?

    <p>To suppress the growth of unwanted microbes while promoting desired ones</p> Signup and view all the answers

    Which type of media is used to grow Chemoautotrophs and Photoautotrophs?

    <p>Nonsynthetic/Complex Media</p> Signup and view all the answers

    What is the purpose of Differential Media?

    <p>To differentiate between various microorganisms</p> Signup and view all the answers

    Which type of media is used to cultivate Fastidious Organisms?

    <p>Enrichment Media</p> Signup and view all the answers

    What is the purpose of Nonsynthetic/Complex Media?

    <p>To encourage the growth of all microorganisms</p> Signup and view all the answers

    Which of the following is an example of Differential Media?

    <p>MacConkey Agar</p> Signup and view all the answers

    What is the mechanism of action of Cationic (+) detergents in sanitizing?

    <p>Protein denaturation and disruption of plasma membrane</p> Signup and view all the answers

    Which gaseous sterilant is commonly used due to its high penetration ability and is also carcinogenic?

    <p>Ethylene Oxide</p> Signup and view all the answers

    What is the purpose of using Biological Indicators in sterilization?

    <p>To check the efficacy of sterilization</p> Signup and view all the answers

    What is the mechanism of action of Biguanides, such as Chlorhexidine, in skin disinfection?

    <p>Disruption of plasma membrane</p> Signup and view all the answers

    Which method is commonly used to get pure cultures of microorganisms?

    <p>Streak Plate Method</p> Signup and view all the answers

    What is the classification of antibiotics that inhibit cell wall synthesis, such as Cephalosporins and Bacitracin?

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

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