BIOL202 Week 8 Lab 8 Food Microbiology

Lab 8: Food Microbiology (100 points)  Eachquestiononthelabworksheetmustbeansweredcompletely,thoroughly,incompletesentencesand correctlyin orderto beconsideredforfullcredit  Ifthequestionasksyoutodoresearchorfindasource,areputable,credibleand/orscholarlysourcecitationmustbeincluded inorder tobeconsidered for fullcredit  Ifamathformulaisrequiredtoarrivetoananswer,workmustbeshownotherwise,nocreditwill beawarded Pre-Lab Questions 1. What is the “danger zone” of bacterial growth that consumers are warned against aboutholding foods? (5 points) 2. There are several foods and beverages listed in this lab that are created through theactions of microorganisms. Name five of the foods and the specific microorganisms thatare used to make each of them. (5 points) 3. UsinganonlineresearchtoolsuchastheA-ZindexontheCDCwebsite,explain whyListeria monocytogenesis a major threat to pregnant women and their developingfetuses, who are ten times more likely to get sick than other demographic groups. (5points) Experiment 1 Results Tables  Table1:TimeRequiredforMethyleneBlueColorChange(10points) Experiment 1 Post-Lab Questions 1. Whichsampletooktheleasttimetobecomewhite?Whydoyouthinkthiswasthecase?(5points) 2. Whichsampletookthemosttimetobecomewhite?Whydoyouthinkthiswasthecase?(10 points) 3. Howdoesrefrigerationaffectthenumberofbacteriapresentinmilk?(10points) 4. Howdoespasteurizationaffectthenumberofbacteriapresentinmilk?Whatdifferenceswouldthisassayshowif performedusingraw(unpasteurized) milk?(10 points) 5. Whatdifferenceswouldthisassayshowifperformedusingmilkthatwaspastitsexpirationdateandhad anoff-putting odor?(10 points) Experiment 2 Results Table  Table2:YogurtpHResults(10points) Experiment2Post-LabQuestions 1. Make a graph of the pH changes over the course of the experiment. How does the pHchangeateach step? Why?(10 Points) 2. How does the consistency of the milk change during the production of yogurt? Whatfacilitates this change? Is this related to the breakdown products of lactose and whatabout the taste? (10points)