Factors Affecting Growth of Microorganisms in Foods Quiz
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Questions and Answers

What does the exponential growth model describe?

  • The kinetics of microbial growth over time
  • The kinetics of microbial inactivation over time
  • The shape of the growth curve (correct)
  • The specific growth rate of microorganisms
  • In the exponential growth model, what does N(t) represent?

  • The specific growth rate
  • The time elapsed
  • The final microbial population (correct)
  • The initial microbial population
  • What is the specific growth rate (μ) in the exponential growth model measured in?

  • Degrees Celsius
  • Microbial population size
  • pH units
  • Time^-1 (correct)
  • In the exponential growth model, what happens to the microbial population if the specific growth rate (μ) increases?

    <p>Population growth accelerates</p> Signup and view all the answers

    If a food product is inoculated with 200 CFU/g of a bacterium and undergoes exponential growth with μ = 0.15 per hour, what is the microbial population after 4 hours of incubation?

    <p>240 CFU/g</p> Signup and view all the answers

    Which of the following factors affect the rate of microbial growth in the exponential growth model?

    <p>Temperature only</p> Signup and view all the answers

    What is the primary reason for the low growth rate of large cells?

    <p>Difficulty in transporting nutrients into the cell</p> Signup and view all the answers

    During which phase do microorganisms adapt to their environment?

    <p>Lag phase</p> Signup and view all the answers

    What is the characteristic of the stationary phase?

    <p>Growth rate equals death rate</p> Signup and view all the answers

    Which factor affects microbial growth and survival in food?

    <p>A combination of intrinsic, extrinsic, and implicit factors</p> Signup and view all the answers

    What happens to the microbial population in the death phase?

    <p>It decreases due to various factors</p> Signup and view all the answers

    What is the graph that represents the growth of microorganisms?

    <p>Logarithmic graph</p> Signup and view all the answers

    What is the primary way that microorganisms increase their population?

    <p>Through the increase in the number of cells or population</p> Signup and view all the answers

    What is the result of a single-cellular microbe dividing into two new cells during one growth cycle?

    <p>A 100% increase in cell number</p> Signup and view all the answers

    Why do bacteria have a high rate of metabolism and growth?

    <p>Due to their high surface area to volume ratio</p> Signup and view all the answers

    What is the advantage of small cell size in terms of nutrient exchange?

    <p>They can easily exchange nutrients and remove end-products</p> Signup and view all the answers

    What happens to the surface area to volume ratio of a cell as it ages?

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

    What type of cell division is common in yeast?

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

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