Growth Phases of Organisms
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Questions and Answers

During which phase do organisms increase in size and synthesize enzymes?

  • Decline phase
  • Log phase
  • Stationary phase
  • Lag phase (correct)
  • During which phase does population growth occur at an exponential rate?

  • Log phase (correct)
  • Stationary phase
  • Lag phase
  • Decline phase
  • During which phase does cell division decrease to the point that new cells are produced at the same rate as old cells die?

  • Log phase
  • Stationary phase (correct)
  • Lag phase
  • Decline phase
  • During which phase do cells lose their ability to divide and die?

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

    What is the term for growth in colonies where cells divide at their most rapid rate?

    <p>Generation time</p> Signup and view all the answers

    What is the term for growth in colonies where cells divide sometime during the generation time with a smooth line graph?

    <p>Nonsynchronous growth</p> Signup and view all the answers

    What is the term for a chemically non-defined medium that contains reasonably familiar material but varies slightly in chemical composition from batch to batch?

    <p>Complex media</p> Signup and view all the answers

    What is the term for a common ingredient in media that is a product of enzyme digestion of proteins?

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

    What is the term for materials found in nature that can be used as media?

    <p>Natural media</p> Signup and view all the answers

    Which type of medium encourages the growth of some organisms but suppresses the growth of others?

    <p>Selective medium</p> Signup and view all the answers

    What is the purpose of a selective medium?

    <p>To encourage growth of some organisms and suppress growth of others</p> Signup and view all the answers

    Which medium is both selective and differential?

    <p>Differential medium</p> Signup and view all the answers

    Which substance is fermented by organisms in the human intestines, but not by most pathogens?

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

    Which method is used when a diluted culture is added to a melted nutrient agar and poured into an empty dish?

    <p>Pour plate method</p> Signup and view all the answers

    Which method is used when a diluted sample is placed on the center of a solid cooled agar medium and spread evenly?

    <p>Spread plate method</p> Signup and view all the answers

    What does CFU stand for in microbiology?

    <p>Colony forming unit</p> Signup and view all the answers

    What does MPN stand for in microbiology?

    <p>Most probably number</p> Signup and view all the answers

    What is the purpose of the filtration method in microbiology?

    <p>To estimate the size of small bacterial populations</p> Signup and view all the answers

    What does turbidity measure in microbiology?

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

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