Food Spoilage: Enzymatic Activity
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Questions and Answers

What is the outcome of biochemical activity of microbial processes in food spoilage?

  • Production of off-flavors
  • Formation of brown pigments
  • Acceleration of decay processes
  • All of the above (correct)
  • Insects and pests attacking fruits and vegetables can lead to:

  • Production of off-flavors (correct)
  • Increase in nutritional quality
  • Enhancement of flavor profile
  • Reduction in sugar content
  • Which factor promotes insect growth on food products?

  • Low humidity levels
  • Dark storage conditions
  • High temperature and humidity (correct)
  • Cool environment
  • How do rats and mice contribute to food spoilage?

    <p>By contaminating food with disease-producing microorganisms</p> Signup and view all the answers

    Which environmental factors are necessary for chemical reactions leading to food spoilage?

    <p>Presence of atmospheric oxygen and sunlight</p> Signup and view all the answers

    Which group of bacteria are useful in producing fermented foods like yogurt and pickles?

    <p>Lactic acid bacteria (LAB)</p> Signup and view all the answers

    Which bacteria are predominant spoilage organisms under low oxygen, low temperature, and acidic conditions?

    <p>Lactic acid bacteria (LAB)</p> Signup and view all the answers

    What is the primary cause of spoilage due to enzymatic activity?

    <p>Action of endogenous enzymes</p> Signup and view all the answers

    Which type of conditions inhibit the growth of Pseudomonas and related genera?

    <p>High water activity and low pH</p> Signup and view all the answers

    Which group of bacteria includes a number of human pathogens and spoilage organisms?

    <p>Gram-negative bacteria</p> Signup and view all the answers

    Which food is associated with spoilage by Alcaligenes according to the text?

    <p>High protein foods like meat and dairy products</p> Signup and view all the answers

    Which type of bacteria are Gram-positive and useful in producing fermented foods?

    <p>Lactic acid bacteria (LAB)</p> Signup and view all the answers

    What type of odors does Brochothrix produce during spoilage?

    <p>Sour, musty, and sweaty</p> Signup and view all the answers

    Which bacteria are predominant on poultry carcasses on the processing line and have been isolated from spoiled meat and fish?

    <p>Moraxella and Psychrobacter</p> Signup and view all the answers

    Which bacteria uses both lipases and proteases to produce disagreeable odors in dairy products, fish, and meat?

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

    Which bacteria are found widely in the environment, particularly in dairy products, fish, and meat, causing disagreeable odors through lipid and protein degradation?

    <p>Flavobacterium and Brochothrix</p> Signup and view all the answers

    Which bacteria is an important constituent of the microflora on the surface of fish and can produce trimethylamine in vacuum-packaged fish?

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

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