The Gram Stain (Gram-Positive vs Gram-Negative) and The Structure of the bacterial cell wall | Microbiology 🧫 In this video, you learn about the following concepts: Peptidoglycan, Lipopolysaccharide (LPS) Endotoxin (vs Exotoxin), Lipoteichoic acid, Teichoic acid. Gram stain uses crystal violet. Gram positive bacteria appears purple (Violet) whereas gram negative organisms appear pink in color (Fuscin). Why is that? | Medicosis Perfectionalis