Mannitol Salt Agar and Staphylococci
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Questions and Answers

What type of flagella arrangement does Escherichia coli have?

  • Peritrichous (correct)
  • Amphitrichous
  • Monotrichous
  • Lophotrichous

    • Why is Escherichia coli considered to have a competitive growth advantage?

  • It lacks flagella
  • It requires specific media for growth
  • It can synthesize all 20 essential amino acids (correct)
  • It has a slow generation time

    • Which of the following is NOT a characteristic of Escherichia coli?

  • Most are harmless
  • Can cause gastroenteritis
  • Part of the normal microbiome
  • Non-motile (correct)

    • What is the role of Escherichia coli in the host's body?

    <p>Aid in food digestion</p> Signup and view all the answers

    In a bacterial population growing rapidly under ideal conditions, what type of growth curve would be observed?

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

    What is the purpose of Mannitol Salt Agar in microbiology?

    <p>To differentiate between mannitol fermenters and non-fermenters</p> Signup and view all the answers

    What distinguishes Salmonella and Shigella from other members of the Enterobacteriaceae family on Hektoen agar?

    <p>Blue-green color</p> Signup and view all the answers

    What is the main purpose of enrichment media in microbiology?

    <p>To encourage growth of desired microbes to detectable levels</p> Signup and view all the answers

    What is the significance of blood agar in microbiology?

    <p>To observe the effect of haemolysins on RBCs</p> Signup and view all the answers

    Which type of media suppresses unwanted microbes and encourages the growth of desired ones?

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

    How are mannitol fermenters distinguished from non-fermenters on Mannitol Salt Agar?

    <p>By yellow/pink color change in the agar</p> Signup and view all the answers

    Which type of media is designed to encourage the growth of specific organisms while inhibiting others?

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

    What is the main purpose of enrichment media?

    <p>To encourage the growth of a particular organism</p> Signup and view all the answers

    Which agar is selective for staphylococci as it inhibits the growth of other bacteria?

    <p>Mannitol salt agar</p> Signup and view all the answers

    What distinguishes differential media from other types of media?

    <p>Contains indicators to visually differentiate between organisms</p> Signup and view all the answers

    A faecal specimen suspected to contain Salmonella would most likely be cultured using which type of media?

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

    Tetrathionate broth is an example of which type of media used for clinical diagnosis?

    <p><strong>Selective media</strong></p> Signup and view all the answers

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