Foodborne Microbes and Water Activity
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Questions and Answers

Which group of microbes typically requires the highest water activity (aw) for growth?

  • Gram-negative bacteria (correct)
  • Gram-positive non-spore-forming bacteria
  • Lactobacillaceae
  • Staphylococci
  • At what approximate minimum water activity can Staphylococci grow?

  • aw of 0.93
  • aw of 0.86 (correct)
  • aw of 0.96
  • aw of 0.90
  • Below which water activity level do Staphylococci not produce toxins?

  • aw of 0.93 (correct)
  • aw of 0.90
  • aw of 0.86
  • aw of 0.96
  • Which family of bacteria typically has a minimum aw requirement near 0.94?

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

    Some members of which bacterial family can grow below an aw of 0.90?

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

    Staphylococcus aureus is the only pathogenic microorganism mentioned in the text.

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

    Lactic acid bacteria are considered spoilage microorganisms in food.

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

    Interactions between microorganisms in food matrices can only lead to the inhibition of pathogenic bacteria.

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

    Starter cultures are always added to food to enhance flavor development.

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

    Probiotics are live microorganisms that can only confer benefits to gut health.

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

    Food microbiology is solely concerned with the study of pathogenic microorganisms in food systems.

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

    The growth of microorganisms in food environments can influence the safety, quality, and shelf life of food products.

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

    Fermentation processes, such as yogurt production, involve the beneficial action of microorganisms.

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

    The minimum water activity ($a_w$) required for the growth of microorganisms is consistent across all types of microbes.

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

    Studying antimicrobial agents is not a part of food microbiology, as it falls under the domain of pharmaceutical sciences.

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

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