Bacterial Generation Time and Population Growth
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Questions and Answers

What term refers to the time required for a cell to divide and its population to double?

  • Death phase
  • Growth lag time
  • Logarithmic time
  • Generation time (correct)
  • During which growth phase do bacteria multiply at the fastest rate possible under the provided conditions?

  • Log phase (correct)
  • Lag phase
  • Stationary phase
  • Death phase
  • What type of representation is used for bacterial populations where division occurs in a logarithmic progression?

  • Geometric progression
  • Exponential progression (correct)
  • Linear progression
  • Arithmetic progression
  • In which phase of growth does equilibrium exist between cell division and cell death?

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

    What method involves direct measurement of microbial growth through the use of Heterotrophic plate count and Direct microscopic count?

    <p>Filtration method</p> Signup and view all the answers

    Which bacterial growth curve phase experiences a situation where the number of deaths exceed the number of new cells formed?

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

    What is the significance of understanding the conditions necessary for microbial growth?

    <p>To control the growth of helpful microbes</p> Signup and view all the answers

    What are the physical requirements for microbial growth?

    <p>Temperature, pH, Osmotic pressure</p> Signup and view all the answers

    Which term describes bacteria that thrive in cold environments?

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

    What is the most common method of food preservation mentioned in the text?

    <p>Low temperatures</p> Signup and view all the answers

    At what temperature do most bacteria grow within a limited range?

    <p>At moderate temperatures</p> Signup and view all the answers

    What do psychrophiles prefer in terms of temperature?

    <p>Cold loving</p> Signup and view all the answers

    What is the range of pH where most bacteria grow best?

    <p>pH 6.5 to 7.5</p> Signup and view all the answers

    Which microorganisms have an optimum pH range of 5 to 6 for growth?

    <p>Molds &amp; yeasts</p> Signup and view all the answers

    What are chemical buffers used for in bacterial cultures?

    <p>To neutralize acids and maintain proper pH</p> Signup and view all the answers

    In a hypertonic solution, what happens to cellular water in microbial cells?

    <p>It leaks out through the plasma membrane</p> Signup and view all the answers

    What is the primary physical growth requirement for microorganisms?

    <p>Nutrients in solution</p> Signup and view all the answers

    Which microorganisms tolerate acidity and thrive in lower pH levels?

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

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