Microbial Growth and Requirements Quiz
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Questions and Answers

What is the purpose of observing a culture medium in the lab?

  • To measure temperature preferences
  • To observe microbial growth (correct)
  • To assess oxygen requirements
  • To determine the type of bacteria present

    • What happens if the osmotic pressure is not equal inside and outside a cell?

  • The cell will produce more macronutrients
  • The cell will become dormant
  • The cell will shrink or swell (correct)
  • The cell will increase oxygen requirements

    • Which type of microbe thrives at low temperatures?

  • Psychrophiles (correct)
  • Thermophiles
  • Mesophiles
  • Halophiles

    • Which of the following chemicals is considered a macronutrient required by microbes in large quantities?

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

    What is the primary source of carbon for autotrophic microbes?

    <p>CO2</p> Signup and view all the answers

    How do halophiles survive in high-salt environments?

    <p>They produce negatively-charged solutes to balance osmotic pressure</p> Signup and view all the answers

    Which organic compounds contain nitrogen?

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

    What organic compounds contain sulfur?

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

    Which type of microbes can grow in the absence of oxygen?

    <p>Facultative anaerobes</p> Signup and view all the answers

    What are micronutrients also known as?

    <p>Trace elements</p> Signup and view all the answers

    Which type of culture media appears as a solid preparation for microbial growth?

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

    What is the difference between a colony and a pure culture?

    <p>A colony is a population of cells from a single cell or group, while a pure culture contains only one species.</p> Signup and view all the answers

    Which type of media requires the removal of all available O2 and is used for anaerobic bacteria growth?

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

    What is the main purpose of selective media in bacterial culture?

    <p>To suppress unwanted microbes and encourage growth of desired microbes.</p> Signup and view all the answers

    Which type of media allows for the differentiation between bacteria within the same group?

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

    What is the process by which bacterial growth occurs through cell division?

    <p>Binary fission</p> Signup and view all the answers

    What method of measuring microbial growth involves indirect measurements like turbidity and metabolic activity?

    <p>Plate count</p> Signup and view all the answers

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