SBT1313 Week 13 Food Microbiology Quiz
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Questions and Answers

Which factor influences the growth of yeast and molds in food?

  • High pH
  • High water activity
  • Presence of antimicrobial substances
  • Low pH (correct)
  • What type of microorganisms are favored by a reducing environment in meat products?

  • Mesophiles
  • Facultative anaerobes
  • Aerobes
  • Anaerobes (correct)
  • What do allicin and polyphenols act as in inhibiting microbial growth?

  • Sweeteners
  • Preservatives (correct)
  • Emulsifiers
  • Colorants
  • What characteristic of modern shrink-wrap materials and vacuum technology helps prolong the shelf life of food?

    <p>Permeability to oxygen</p> Signup and view all the answers

    What type of food composition would likely result in the predominance of fungal growth without major odors?

    <p>Primary carbohydrates</p> Signup and view all the answers

    What characteristic of temperature retards microbial growth in food?

    <p>Lower temperatures</p> Signup and view all the answers

    What is the primary factor that influences the growth of bacteria in food?

    <p>pH level</p> Signup and view all the answers

    What does a reduced water activity achieve in controlling microbial growth in food?

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

    What type of microorganisms are favored by lower pH in food?

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

    What factor is critical for influencing microbial growth in food?

    <p>Food composition</p> Signup and view all the answers

    In a food with high protein and/or fats, what type of microorganisms are more likely to grow?

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

    What type of pH favors the growth of yeast and molds in food?

    <p>Low pH</p> Signup and view all the answers

    How can water activity be reduced to control microbial growth in food?

    <p>Drying food and adding solutes like salt and sugar</p> Signup and view all the answers

    What characteristic does a lower oxidation-reduction potential create for microbial growth in meat products?

    <p>Reducing environment</p> Signup and view all the answers

    Which factor promotes the mixing and distribution of contaminating microorganisms throughout food like sausage and hamburger?

    <p>Physical structure of food</p> Signup and view all the answers

    How does the atmosphere in which food is stored affect microbial growth?

    <p>Higher oxygen levels promote growth</p> Signup and view all the answers

    What type of foods have natural antimicrobial substances such as coumarins and lysozyme?

    <p>Fruits and vegetables</p> Signup and view all the answers

    What does putrefaction involve in the spoilage of food?

    <p>Anaerobic breakdown of proteins</p> Signup and view all the answers

    What type of microorganisms are favored by an alkaline pH in food?

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

    How do lower temperatures affect microbial growth?

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

    What does a low pH favor the growth of in food?

    <p>Yeast and molds</p> Signup and view all the answers

    What factor influences microbial growth in food composition?

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

    What does the presence and availability of water do in general to microbial growth?

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

    What characteristic of meat products creates a reducing environment for microbial growth?

    <p>Low oxidation-reduction potential</p> Signup and view all the answers

    What type of microorganisms grow best in a media with high osmotic concentration?

    <p>Osmophilic microorganisms</p> Signup and view all the answers

    What characteristic of modern shrink-wrap materials and vacuum technology helps prolong the shelf life of food?

    <p>Inhibiting bacterial growth</p> Signup and view all the answers

    Which type of microorganisms are favored by lower pH in food?

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

    What does the grinding and mixing of food do for microbial growth?

    <p>Promotes surface area and distribution of microorganisms</p> Signup and view all the answers

    What do allicin and polyphenols act as in inhibiting microbial growth?

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

    What type of foods have natural antimicrobial substances like coumarins and lysozyme?

    <p>Vegetables and fruits</p> Signup and view all the answers

    What type of microorganisms are favored by an alkaline pH in food?

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

    What characteristic of temperature retards microbial growth in food?

    <p>Lower temperatures retard microbial growth</p> Signup and view all the answers

    What is the focus of the conference presentation?

    <p>Microbial habitat diversity</p> Signup and view all the answers

    In what context is 'Breakout questions' mentioned?

    <p>Conference logistics</p> Signup and view all the answers

    What aspect of microbiology is discussed from a soil scientist's perspective?

    <p>Decomposition of residue</p> Signup and view all the answers

    What is the primary focus of the conference presentation on 28/05/20XX?

    <p>Residue decomposition</p> Signup and view all the answers

    What concept is associated with the term 'residue decomposition'?

    <p>Microbial communication</p> Signup and view all the answers

    From which perspective is the analysis of 'predation' likely to be discussed at the conference?

    <p>Microbial ecologist</p> Signup and view all the answers

    What aspect of microbiology is relevant to both aquatic and soil habitats?

    <p>Residue decomposition</p> Signup and view all the answers

    Which concept is likely to be associated with 'pathogenesis' in the context of the conference?

    <p>Microbial diversity</p> Signup and view all the answers

    What is the main topic of the conference presentation on 8/05/20XX?

    <p>Residue decomposition</p> Signup and view all the answers

    What is the focus of 'Breakout questions' mentioned on 8/05/20XX?

    <p>Residue decomposition</p> Signup and view all the answers

    How has technology impacted our ability to communicate with each other?

    <p>Improved our ability to communicate effectively</p> Signup and view all the answers

    What is the primary stimulus for the production of nod factors by Rhizobium during root nodule formation?

    <p>Plant root release of flavonoids</p> Signup and view all the answers

    What describes the initial interaction between Rhizobium and the plant root during root nodule formation?

    <p>Attachment of Rhizobium to root hair</p> Signup and view all the answers

    What is the process that follows the production of nod factors by Rhizobium during root nodule formation?

    <p>Cell to cell spread of Rhizobium</p> Signup and view all the answers

    How has technology affected the quality of communication among individuals?

    <p>Enhanced the quality of communication</p> Signup and view all the answers

    What is the outcome of flavonoids released by plant roots during root nodule formation?

    <p>Stimulate production of nod factors by Rhizobium</p> Signup and view all the answers

    What is an example of mutualism discussed in the text?

    <p>Lichens association of specific fungi and certain algae</p> Signup and view all the answers

    What follows after the attachment of Rhizobium to the plant root hair during root nodule formation?

    <p>Root hair curling</p> Signup and view all the answers

    What is an example of a symbiotic relationship discussed in the text?

    <p>Lichens association of specific fungi and certain algae</p> Signup and view all the answers

    In what way has technology influenced global connectivity?

    <p>Expanded global connectivity through improved communication channels</p> Signup and view all the answers

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