Solution-Presence of air bubbles a sign of contamination

Microbiology

1. For what specific purpose was gram staining developed for? what is it used for today?

2. Why is the presence of air bubbles a sign of contamination?

3. Why is a gram stain helpful when monitoring bacterial contamination in food or investigating a foodborne illness outbreak?

4. Do you think bacteria always have to be gram stained in order to view them? why or why not?

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