Why is milkusuallyheatedbefore cultureis added?To kill anyunwantedbacteriaWrite thetypicalprocess forproducingyoghurtHeat milk to killbacteria, cool milkto ~40C, addstarter culture,incubate for 4-8hours, pack andstore at 5CCan we makeyoghurt at lowand hightemperatures?Yes, but thecultures willtake longerto growHow can weproduce afirmer andmore tartyoghurt?Use morestarterculture orferment forlongerWhat type offermentationis used?Anaerobicfermentation,i.e., in theabsence ofoxygenWhat wasteproduct isexcreted by thebacteria duringfermentation?LacticacidWhat abioticand abioticfactors affectyoghurtproduction?Write thereactionfor energyproductionLactose(sugar) -->Lactic acid+ energyWhathappenedwith differentmilks?Soy milkmade a weakyoghurt whileoat milk didnot workHow doesheating themilk affectthe milkproteins?The milk proteinsget damaged bythe heat(denaturation)and can form afirmer coagulumGiveexamples ofMRS GRENfor yoghurtproductionWhathappensto the pHand why?The pHdecreasesas lactose isconverted tolactic acidWhat isyoghurt?AfermentedmilkproductWhathappenedwith differentamounts ofculture?More cultureresulted in afirmer yoghurtas morebacteria werepresentWhatmicroorganismsare used?LactobaccilusbulgaricusandStreptococcusthermophilusDescribe thereproductionof theyoghurtbacteriaBinaryfission and atypicalgrowth curveWhy isyoghurt putin the fridgefor storage?To minimiseany furtherfermentationWhat are thetypical pHvalues ofmilk andyoghurt?Milk is6.8, andyoghurt is4.5How do weevaluatetheyoghurt?pH value,smell,appearance,taste, textureWhathappens tostarter culturegrowth as thepH drops?BacterialgrowthdecreasesWhy is milkusuallyheatedbefore cultureis added?To kill anyunwantedbacteriaWrite thetypicalprocess forproducingyoghurtHeat milk to killbacteria, cool milkto ~40C, addstarter culture,incubate for 4-8hours, pack andstore at 5CCan we makeyoghurt at lowand hightemperatures?Yes, but thecultures willtake longerto growHow can weproduce afirmer andmore tartyoghurt?Use morestarterculture orferment forlongerWhat type offermentationis used?Anaerobicfermentation,i.e., in theabsence ofoxygenWhat wasteproduct isexcreted by thebacteria duringfermentation?LacticacidWhat abioticand abioticfactors affectyoghurtproduction?Write thereactionfor energyproductionLactose(sugar) -->Lactic acid+ energyWhathappenedwith differentmilks?Soy milkmade a weakyoghurt whileoat milk didnot workHow doesheating themilk affectthe milkproteins?The milk proteinsget damaged bythe heat(denaturation)and can form afirmer coagulumGiveexamples ofMRS GRENfor yoghurtproductionWhathappensto the pHand why?The pHdecreasesas lactose isconverted tolactic acidWhat isyoghurt?AfermentedmilkproductWhathappenedwith differentamounts ofculture?More cultureresulted in afirmer yoghurtas morebacteria werepresentWhatmicroorganismsare used?LactobaccilusbulgaricusandStreptococcusthermophilusDescribe thereproductionof theyoghurtbacteriaBinaryfission and atypicalgrowth curveWhy isyoghurt putin the fridgefor storage?To minimiseany furtherfermentationWhat are thetypical pHvalues ofmilk andyoghurt?Milk is6.8, andyoghurt is4.5How do weevaluatetheyoghurt?pH value,smell,appearance,taste, textureWhathappens tostarter culturegrowth as thepH drops?Bacterialgrowthdecreases

Yoghurt Bingo - Call List

(Print) Use this randomly generated list as your call list when playing the game. There is no need to say the BINGO column name. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
  1. To kill any unwanted bacteria
    Why is milk usually heated before culture is added?
  2. Heat milk to kill bacteria, cool milk to ~40C, add starter culture, incubate for 4-8 hours, pack and store at 5C
    Write the typical process for producing yoghurt
  3. Yes, but the cultures will take longer to grow
    Can we make yoghurt at low and high temperatures?
  4. Use more starter culture or ferment for longer
    How can we produce a firmer and more tart yoghurt?
  5. Anaerobic fermentation, i.e., in the absence of oxygen
    What type of fermentation is used?
  6. Lactic acid
    What waste product is excreted by the bacteria during fermentation?
  7. What abiotic and abiotic factors affect yoghurt production?
  8. Lactose (sugar) --> Lactic acid + energy
    Write the reaction for energy production
  9. Soy milk made a weak yoghurt while oat milk did not work
    What happened with different milks?
  10. The milk proteins get damaged by the heat (denaturation) and can form a firmer coagulum
    How does heating the milk affect the milk proteins?
  11. Give examples of MRS GREN for yoghurt production
  12. The pH decreases as lactose is converted to lactic acid
    What happens to the pH and why?
  13. A fermented milk product
    What is yoghurt?
  14. More culture resulted in a firmer yoghurt as more bacteria were present
    What happened with different amounts of culture?
  15. Lactobaccilus bulgaricus and Streptococcus thermophilus
    What microorganisms are used?
  16. Binary fission and a typical growth curve
    Describe the reproduction of the yoghurt bacteria
  17. To minimise any further fermentation
    Why is yoghurt put in the fridge for storage?
  18. Milk is 6.8, and yoghurt is 4.5
    What are the typical pH values of milk and yoghurt?
  19. pH value, smell, appearance, taste, texture
    How do we evaluate the yoghurt?
  20. Bacterial growth decreases
    What happens to starter culture growth as the pH drops?