Microbial Growth: Intrinsic Factors - pH and Preservation
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Questions and Answers

What is the optimal pH for the growth of most foodborne bacteria?

  • About 7 (correct)
  • About 3.5
  • About 4.5
  • About 10
  • What is the pH of a substance with a hydrogen ion concentration of 10^(-7) M?

  • 10
  • 13
  • 1
  • 7 (correct)
  • Which of the following microorganisms is most likely to grow at a pH of 4.5?

  • Bacteria
  • Yeast (correct)
  • Moulds
  • All of the above
  • What is the minimum pH at which Clostridium can grow?

    <p>4.6</p> Signup and view all the answers

    What happens to the growth rate of microorganisms when the pH is not equal to the optimal pH?

    <p>It declines</p> Signup and view all the answers

    At what pH does the growth rate of microorganisms decline?

    <p>When pH is not equal to pHopt</p> Signup and view all the answers

    What is the term for a microorganism that grows optimally at a pH of 7?

    <p>Neutralophile</p> Signup and view all the answers

    What is the optimum pH for the growth of yeast?

    <p>About 4.5</p> Signup and view all the answers

    What is the relation between pH and hydrogen ion concentration?

    <p>pH is inversely proportional to hydrogen ion concentration</p> Signup and view all the answers

    What is the optimum pH for the growth of moulds?

    <p>About 3.5</p> Signup and view all the answers

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