Microbial Growth: Observation and Requirements
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Questions and Answers

What is the ideal osmotic pressure condition for microbial survival?

  • Hyperosmotic environment
  • Isotonic environment (correct)
  • Hypertonic environment
  • Hypotonic environment
  • Which of the following is an example of a psychrophile?

  • Bacteria thriving in high-temperature environments
  • Molds and yeasts thriving in acidic environments
  • Thermophiles
  • Organisms that prefer cold temperatures (correct)
  • What is the main reason microbes need carbon?

  • To regulate pH levels
  • To produce energy (correct)
  • To maintain osmotic pressure
  • To synthesize proteins
  • Which of the following statements about temperature preferences of microbes is correct?

    <p>Thermophiles prefer high temperatures</p> Signup and view all the answers

    What is the effect of unequal osmotic pressure inside and outside a microbial cell?

    <p>Cell shrinkage leading to cell death</p> Signup and view all the answers

    Which microbial category thrives in high salt environments by balancing osmotic pressure?

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

    What is the primary source of carbon for microbes that are autotrophs?

    <p>$CO_2$</p> Signup and view all the answers

    What is the significance of macronutrients for microbial growth?

    <p>They act as energy sources for metabolism</p> Signup and view all the answers

    Which environmental factor plays a crucial role in determining the growth characteristics of bacteria and molds?

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

    What is the term for introducing microbes into a medium?

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

    Which type of media is known for having a varying chemical composition from batch to batch?

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

    What is the main purpose of selective media?

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

    Which type of media is considered non-selective and stimulates the growth of various bacterial species?

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

    What is the process called when bacteria increase in number through cell division?

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

    Which method of measuring microbial growth involves counting cells directly?

    <p>Direct microscopic count</p> Signup and view all the answers

    What is the term for a population of cells originating from a single cell or group of attached cells?

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

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

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

    What is the term used to describe a population of cells from a single cell or group of attached cells?

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

    Which organic compounds contain nitrogen?

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

    Which type of media stimulates the growth of many different types of bacterial species and often exists as liquid?

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

    Which organic compound contains phosphorus?

    <p>Nucleic acids</p> Signup and view all the answers

    What are micronutrients also known as?

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

    Which chemicals are usually function as inorganic enzyme cofactors?

    <p>Iron, copper, zinc</p> Signup and view all the answers

    What is the function of organic growth factors in microbes?

    <p>Energy production</p> Signup and view all the answers

    What type of microbes grow in liquid (broth) media?

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

    What are solid media for microbial growth made of?

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

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