Gram-Negative Rods: Classification and Characteristics
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Questions and Answers

What is the main basis for classifying medically important gram-negative rods?

  • Geographical distribution
  • Physical size and shape
  • Biochemical properties (correct)
  • Antibiotic resistance
  • Where are medically important gram-negative rods commonly found?

  • In soil, water, and vegetation (correct)
  • On high mountain peaks
  • In the air
  • In deep ocean trenches
  • What is the relationship between medically important gram-negative rods and intestinal flora?

  • They are harmful to the intestinal flora
  • They only exist in the intestinal flora of animals
  • They have no relationship with intestinal flora
  • They are part of the normal intestinal flora of most animals and humans (correct)
  • How many genera are included in the largest collection of medically important gram-negative rods?

    <p>More than 50 genera</p> Signup and view all the answers

    Which of the following best describes the classification basis for medically important gram-negative rods?

    <p>Biochemical properties, antigenic structure, and molecular analysis of genomes</p> Signup and view all the answers

    Where are medically important gram-negative rods commonly found?

    <p>In soil, water, and vegetation</p> Signup and view all the answers

    What is the primary habitat of medically important gram-negative rods?

    <p>Soil and water</p> Signup and view all the answers

    How many genera are included in the largest collection of medically important gram-negative rods?

    <p>More than 50 genera</p> Signup and view all the answers

    Which characteristic is used to distinguish Enterobacteriaceae from other gram-negative rods?

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

    What is a characteristic feature of Plesiomonas that distinguishes it from other members of the family Enterobacteriaceae?

    <p>Oxidase positivity</p> Signup and view all the answers

    What is a common characteristic of medically important gram-negative rods in terms of their nutritional requirements?

    <p>Simple nutritional requirements</p> Signup and view all the answers

    Which test is used to distinguish Enterobacteriaceae from many other gram-negative rods?

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

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