You are performing a Gram stain on gram- positive bacteria and you stop after the addition of the first dye. What is the appearance of the bacteria at this point?
A) colorless
B) purple
C) brown
D) red

Question

Quizplus · Accepted Answer

The first dye in a Gram stain is crystal violet, which stains both Gram-positive and Gram-negative bacteria purple. Therefore, even if you stop after adding the first dye, the Gram-positive bacteria will still appear purple.

You Are Performing a Gram Stain on Gram- Positive Bacteria