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Questions and Answers
How can you differentiate between gram positive and gram negative bacteria on a slide?
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?
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?
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?
What is the significance of Coagulase positive in bacterial identification?
What is the main function of fimbriae in bacteria?
What is the main function of fimbriae in bacteria?
Which virulence factor enables swimming for protozoa, bacteria, and spermatozoa?
Which virulence factor enables swimming for protozoa, bacteria, and spermatozoa?
What is the function of human IgG antibodies binding by Staph aureus?
What is the function of human IgG antibodies binding by Staph aureus?
Which type of toxins are produced by both Gram-positive and Gram-negative cells?
Which type of toxins are produced by both Gram-positive and Gram-negative cells?
What is the function of exotoxins produced by bacteria like Staph aureus?
What is the function of exotoxins produced by bacteria like Staph aureus?
Where is Lipid A portion, which is highly immunoreactive, found in Gram-negative bacteria?
Where is Lipid A portion, which is highly immunoreactive, found in Gram-negative bacteria?
What is the main impact of endotoxins when released into the blood upon bacterial death?
What is the main impact of endotoxins when released into the blood upon bacterial death?
Which specific bacteria have the ability to form endospores that are hard to kill?
Which specific bacteria have the ability to form endospores that are hard to kill?
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