Microorganism Destruction and Temperature
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Questions and Answers

What is the main factor that influences the destruction of microorganisms?

  • Initial concentration of microorganisms
  • Type of microorganisms present
  • Temperature (correct)
  • Time of reaction

What is the unit of measurement used to express the degree of destruction of microorganisms?

  • Number of decimal reductions (log N0/N) (correct)
  • Rate of reaction in minutes
  • Number of microorganisms per milliliter
  • Percentage of microorganisms destroyed

What is the order of reaction assumed for the destruction of microorganisms?

  • Third-order reaction
  • Second-order reaction
  • Zero-order reaction
  • First-order reaction (correct)

What is the general effect of enzymes on dairy products?

<p>Enzymes can have both positive and negative effects on dairy products (A)</p> Signup and view all the answers

Which enzyme has a positive effect on the quality of cheese during ripening?

<p>Xanthine oxidase (A)</p> Signup and view all the answers

What is the minimum loss of thiamine required for UHT milk?

<p>Less than 3% (B)</p> Signup and view all the answers

What is the primary effect of denaturation of β-lactoglobulin on yoghurt?

<p>Improves its texture (C)</p> Signup and view all the answers

What is the primary reaction responsible for the formation of new components in heated milk?

<p>Maillard reaction (A)</p> Signup and view all the answers

What is the purpose of measuring hydroxy methyl furfural (HMF) in heated milk?

<p>To measure the severity of heat treatment (C)</p> Signup and view all the answers

Which of the following proteins is most strongly related to functional properties of dairy products?

<p>β-lactoglobulin (D)</p> Signup and view all the answers

What is the result of the flocculation of casein micelles?

<p>Dephosphorization and cross-linking reactions (B)</p> Signup and view all the answers

What is the primary effect of the Maillard reaction on heated milk?

<p>Production of brown pigments (B)</p> Signup and view all the answers

In what type of dairy product is the formation of brown pigments desirable?

<p>Coffee creamers (D)</p> Signup and view all the answers

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