Microbiology Antibiotics and Dyes Quiz
30 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What type of bacteria are Vancomycin inhibitors selective for?

  • Brucella bacteria
  • Gram-negative bacteria
  • Fungi
  • Gram-positive bacteria (correct)
  • Which of the following is an indicator used in culture media to detect acid or alkaline products?

  • pH indicators (correct)
  • Thionine
  • Basic fuchsin
  • Phenylethyl alcohol
  • What is the purpose of adding dyes and chemical substances like pH indicators in culture media?

  • To provide nutrients for bacteria
  • To inhibit bacterial growth
  • To detect acid or alkaline products (correct)
  • To promote fungal growth
  • Which antibiotic is specifically mentioned as an inhibitor for Proteus bacteria?

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

    What type of organic compounds do heterotrophs metabolize in the body?

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

    What are the products when organic compounds are metabolized by bacteria?

    <p>Acids or alcohols</p> Signup and view all the answers

    Which enrichment broth is specifically used for the growth of Salmonella while inhibiting other normal intestinal flora?

    <p>Selenite F Broth</p> Signup and view all the answers

    What is the main purpose of Todd-Hewitt Broth?

    <p>Support the growth of Streptococci for serological grouping</p> Signup and view all the answers

    Which agar is selective for Gram-negative Enteric bacilli and contains Eosin and Methylene Blue as differential indicators?

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

    In the context of bacteria categorization, what distinguishes lactose fermenters from non-lactose fermenters?

    <p>Utilization of lactose as a carbon source</p> Signup and view all the answers

    If using an organic compound, what differentiates bacteria capable of fermentation from those capable of oxidation?

    <p>Ability to metabolize glucose</p> Signup and view all the answers

    Why should Thioglycolate Broth be used solely in the isolation of anaerobic bacteria?

    <p>It can also grow aerobes and facultative anaerobes</p> Signup and view all the answers

    Which type of bacteria does not produce pigment with or without light?

    <p>Non-Photochromogen</p> Signup and view all the answers

    What is the purpose of adding inhibitor (Trimethroprim) to Proteus on Simmons Citrate Agar (SCA)?

    <p>To control the morphology of Neisseria</p> Signup and view all the answers

    Which culture medium is specifically used for observation of hydrogen sulfide gas production, indole production, and motility?

    <p>Sulfide Indole Motility Medium (SIM)</p> Signup and view all the answers

    Which bacteria are typically observed on Mueller Hinton Agar (MHA) with colonies on the surface of the medium?

    <p>Neisseria spp.</p> Signup and view all the answers

    Which type of bacteria is capable of producing pigment when incubated without light?

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

    In the context of AST, what does it mean when a bacterium is labeled as 'Susceptible'?

    <p>Capable of inhibiting bacteria</p> Signup and view all the answers

    Which bacterial species can tolerate up to 10% salt concentration, except Vibrio cholerae and Vibrio mimicus?

    <p>Bacillus spp.</p> Signup and view all the answers

    What is the degradation product of hemoglobin that serves as the X factor in culture media?

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

    Which type of culture media contains lysed RBC and has both X and V factors?

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

    Why is the V factor not present in Blood Agar Plate (BAP) according to the text?

    <p>The RBC is intact, leading to NADase hydrolyzing the NAD (V factor).</p> Signup and view all the answers

    How can the V factor be preserved in a culture medium that contains NADase, according to the text?

    <p>Applying physical methods such as heat to inactivate NADase.</p> Signup and view all the answers

    Why does Chocolate Agar Plate (CAP) have both X and V factors available according to the text?

    <p>NADase is inactivated by physical methods like heat.</p> Signup and view all the answers

    What is the solidifying agent commonly used in a culture medium?

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

    Which medium is typically used for observation of hydrogen sulfide gas production, indole production, and motility?

    <p>Sulfide Indole Motility (SIM) Medium</p> Signup and view all the answers

    Which type of culture medium is commonly used as a base in the preparation of other culture media?

    <p>Nutrient agar</p> Signup and view all the answers

    What function does a primary media enriched with blood serve in microbiology?

    <p>To promote growth of fastidious microorganisms</p> Signup and view all the answers

    Which chemicals are commonly used as inhibitors for gram-positive bacteria in culture media?

    <p>Sodium deoxycholate and thiosulfate</p> Signup and view all the answers

    What is the purpose of a culture medium containing additives and supplements to support the growth of fastidious microorganisms?

    <p>To support the growth of fastidious microorganisms</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser