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Identifying Gram Positive and Gram Negative Bacteria

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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?

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

What is the main function of fimbriae in bacteria?

Attachment (D) Signup and view all the answers

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

Flagellum (C) Signup and view all the answers

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

To provide disguise (A) Signup and view all the answers

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

Cytotoxins (A) Signup and view all the answers

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

Inhibit protein synthesis (A) Signup and view all the answers

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

Exposed on the cell membrane surface (A) Signup and view all the answers

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

Massive inflammatory response (C) Signup and view all the answers

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

Clostridium tetani and Bacillus anthracis (D) Signup and view all the answers