9. Microscopes

If a Gram stain result is unclear, which of the following should be considered?

In the Gram stain procedure, which dye is used as the counterstain?

Which of the following correctly lists the order of reagents used in the Gram stain procedure?

In the Gram stain, why must fresh (young) bacterial cells be used to obtain reliable results?

In a standard Gram stain, what color do Gram-negative bacteria typically appear after the safranin counterstain is applied?

Which of the following would you include when performing a Gram stain?

Which of the following correctly lists the steps of the Gram stain procedure in the proper order?

After performing a Gram stain, why do Gram-positive bacteria appear purple under the microscope?

The Gram-staining procedure is best described as which of the following?

In a completed Gram stain procedure, what is the final color of Gram-negative bacteria when observed under a microscope?

Which dye stains gram-negative bacteria pink during the Gram stain procedure?

1. Why is it important to use fresh bacterial cells when performing a Gram stain?

In the Gram stain procedure, which reagent is used as the decolorizer to remove the crystal violet–iodine complex from Gram-negative cells?

In the Gram stain procedure, what is the correct sequence of reagents applied to a heat-fixed bacterial smear (excluding the initial water rinse)?

Which of the following describes the correct sequence of the Gram stain procedure?