Name____________________

FoodScience:BreadDoughChallengeDidyouknowthatyeastisactuallyalive?Inthebread-makingprocess,itisaliveuntiltheheatoftheovenkillsit.Yeastisacommonleaveningagentusedtomakebreadandotherbakeryproducts.Thefirstuseofyeasttobakebreadisunknown,buttheearliestdefiniterecordscomefromAncientEgypt.

Whatmakesbreaddoughrise?

Howdoyeastcellsgetenergy?

Whatfactorsspeedorslowtheprocessofdoughrising?

Whatisyeast?

PuttingtheScienceinContext

Plantsconvertenergyfromthesunthroughphotosynthesis.

Organismsuseoxygentoperformaerobic cellularrespiration,which

createsATP(energy).

Bacteria,archaea,yeastandmusclecellscanperformanaerobic

respirationwithoutoxygenthroughfermentation.

Remember,allliving

organismsneedenergy!

1. Whichziploc bag(s)expanded?Why?

2. Whatgasdidtheyeastproduce?

3. Whatmoleculedoestheyeastuseforenergy?

4. Whattypeofcellularrespirationdoyeastcellsuse?Howdoyouknow?

5. Howdoyouthinkyoucouldmakethisreactionfasterorslower?

BreadDoughChallengeHowcanyoumakethefastestrisingbreaddough?

1. Listasmanyvariablesyoucanthinkofthatcouldaffectrisingtime.

2. Whatvariablewillyourgrouptest?

3. Howwillyoureviseyourrecipetotestthisvariable?

4. Makeahypothesisbelowabouthowmanipulatingthisvariablewillimpactthefinaloutcomeofthebreaddough.

1/3 cup warm water

1 tablespoon sugar

1 teaspoon yeast

1 cup flour

1 teaspoon oil

Bread Dough

1. In a bowl, mix together the yeast, warm water, and sugar.

2. Add the oil and flour and stir to combine.

3. Knead dough for 2 minutes.

4. Roll dough into a ball and place in a glass jar for observation.

Quick-RisingBread Dough

FoodScienceTeamRecommendation:

1. Usingalltheresultsfromyourexperiment,placethebestrecipeandpreparationinstructionsintherecipecardabove.

2. Provideascientificanalysisbelowforyourrecommendationexplainingwhyitisthebestprocedureformakingquick-risingbreaddough.