Microbiology Growth Media Types Quiz
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Questions and Answers

What is the main purpose of a chemostat in maintaining bacterial population growth?

  • To adjust the dilution rate for nutrient entry and waste exit (correct)
  • To create an overflow of excess bacteria
  • To allow constant removal of bacteria and medium
  • To promote the exponential growth of bacteria
  • In the Petroff-Hausser Counting Chamber Method, what does CFU/mL stand for?

  • Colony-Forming Units per Milliliter (correct)
  • Colony-Found Units per Milliliter
  • Culture Forming Units per Microliter
  • Calculated Filtration Units per Millimeter
  • What is the main advantage of the Dilution Method for counting bacterial colonies?

  • It allows for easy differentiation between Gram-positive and Gram-negative bacteria
  • It allows direct observation of bacterial morphology
  • It ensures precise counting of all bacterial colonies
  • It provides a trend indicating colony concentration (correct)
  • Which method is primarily used to obtain pure cultures of bacteria?

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

    What is the purpose of an enriched medium in bacterial culture?

    <p>To provide specific nutrients for fastidious bacteria</p> Signup and view all the answers

    What does the exponential growth curve in bacteria indicate?

    <p>Multiplicative increase in population with time</p> Signup and view all the answers

    What is the main purpose of a selective medium in bacterial culture?

    <p>Allows only the growth of a specific bacterial species</p> Signup and view all the answers

    Which type of medium allows the growth of distinct bacterial species that can be identified based on their differential growth patterns?

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

    How is a pure culture typically obtained?

    <p>By obtaining colonies of similar morphology, shape, and size</p> Signup and view all the answers

    What is the main characteristic of an enriched medium?

    <p>It is prepared by addition of complex, nutritious bases</p> Signup and view all the answers

    In binary fission, what does a viable bacterium divide into?

    <p>Two daughter clones</p> Signup and view all the answers

    If E.coli has a generation time of 20 minutes, how many bacteria will be present after 1 hour starting with one bacterium?

    <p>$16$ bacteria</p> Signup and view all the answers

    Which type of medium contains known amounts of nutrients and is used when nutritional requirements of the microorganism are unknown?

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

    In microbiology, which type of medium allows for the isolation of specific types of bacteria while inhibiting the growth of others?

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

    What is the term used to describe a culture that contains only one species or strain of microorganism?

    <p>Pure culture</p> Signup and view all the answers

    Which type of medium contains additional nutrients to support the growth of fastidious microorganisms?

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

    During exponential growth in bacteria, what is increasing exponentially?

    <p>Population size</p> Signup and view all the answers

    Which type of medium distinguishes between different microorganisms based on their biochemical characteristics?

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

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