cell wall in gram positive bacteria is composed of

1. lipid and protein
2. murein
3. proteins only
4. cellulose and pectin

The correct option is 2.
Gram-positive bacteria are a class of bacteria that take up the crystal violet stain used in the Gram staining method of bacterial differentiation. The thick peptidoglycan layer in the cell wall that encases their cell membrane retains the stain, making definitive identification possible.