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5 Written questions

5 Matching questions

  1. nitrates and nitrites
  2. benzoic acid
  3. least sensitive
  4. competition
  5. listeria
  1. a Range of radiation sensitivity: clostridium and bacillus (spores)
  2. b (genus) bacteria associated with unpasteurized cheese and "pre-cooked meats"-hot dogs, deli meats
  3. c pathogens are trapped in floc. They get killed by _________: intestinal microbes are not well adapted to this environment. Lose out by ____ for nutrients to "good bugs'
  4. d common in preserved meats such as bacon, pepperoni. KILL microbes (Cidal agent) like salmonella by inhibiting enzymes used in ATP productions. Preserve red color of hemoglobin.
  5. e Organic acids. Added to juices, jams, tomatoes, soda (salt)

5 Multiple choice questions

  1. (species) bacteria that grow in food, orginally from skin. Secrete toxin into food that induces vomiting and diarrhea. Self-limiting. Associated with SALTY foods.
  2. Organic acids. Produced by fermentation. Added to bread (Swiss cheese)
  3. end product of anaerobic sludge digester. Organics will be fermented or organic acids + carbon dioxide. It is then converted to _________ by methanogens.
  4. pathogens are trapped in floc. They get killed by _________: protozoans eat bacteria
  5. 0-4C. Slows metabolism and growth. Extend shelf life but not forever. Does create good conditions for psychrophiles. Ex) lactobacillus, listeria, pseudomonas

5 True/False questions

  1. Radiationpermitted for some foods. Will sterilize but can/will cause chemical changes in food. Creates peroxides that degrade proteins. End product: NH3 and amines. Degrade fats, short chain fatty acids. Was concern might create carcinogen.

          

  2. 140C for 2 secultra high temp. Usually sterilized milk, if sealed, don't need to refrigerate.

          

  3. 120Ccanning temperature needed for high acid foods (pH<4.5). Kills all vegetative cells. If spores survive, can't germinate at low pH

          

  4. Radiationpathogens are trapped in floc. They get killed by _________: protozoans eat bacteria

          

  5. 100Ccanning temperature needed for high acid foods (pH<4.5). Kills all vegetative cells. If spores survive, can't germinate at low pH

          

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