Identifying Gram Positive and Gram Negative Bacteria
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Questions and Answers

How can you differentiate between gram positive and gram negative bacteria on a slide?

  • Positive bacteria are red/pinkish after washing, while negative bacteria retain crystal violet dye.
  • Positive bacteria retain crystal violet dye, while negative bacteria do not retain the dye. (correct)
  • Negative bacteria are purple, while positive bacteria do not retain crystal violet dye.
  • Negative bacteria are purple, while positive bacteria turn red/pinkish after washing.

What color does a gram negative bacterium appear on a slide after washing?

  • Pinkish (correct)
  • Blue
  • Purple
  • Red

Which bacterium is identified using acid-fast stain instead of gram staining?

  • Staphylococcus aureus
  • Mycobacterium tuberculosis (correct)
  • Bacillus anthracis
  • Escherichia coli

What is the significance of Coagulase positive in bacterial identification?

<p>It indicates an infection caused by Staphylococcus aureus. (B)</p> Signup and view all the answers

What is the main function of fimbriae in bacteria?

<p>Attachment (D)</p> Signup and view all the answers

Which virulence factor enables swimming for protozoa, bacteria, and spermatozoa?

<p>Flagellum (C)</p> Signup and view all the answers

What is the function of human IgG antibodies binding by Staph aureus?

<p>To provide disguise (A)</p> Signup and view all the answers

Which type of toxins are produced by both Gram-positive and Gram-negative cells?

<p>Cytotoxins (A)</p> Signup and view all the answers

What is the function of exotoxins produced by bacteria like Staph aureus?

<p>Inhibit protein synthesis (A)</p> Signup and view all the answers

Where is Lipid A portion, which is highly immunoreactive, found in Gram-negative bacteria?

<p>Exposed on the cell membrane surface (A)</p> Signup and view all the answers

What is the main impact of endotoxins when released into the blood upon bacterial death?

<p>Massive inflammatory response (C)</p> Signup and view all the answers

Which specific bacteria have the ability to form endospores that are hard to kill?

<p>Clostridium tetani and Bacillus anthracis (D)</p> Signup and view all the answers

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