What are the specialized structures formed with cytoplasmic membrane and outer membrane when gram-negative cells are treated with the enzyme lysozyme?

If peptidoglycan is digested away from the cell, gram-positive cells lose their cell walls and become protoplasts while the gram negative cells become spheroplasts. A spheroplast is a cell from which the cell wall has been almost completely removed as by the action of penicillin. The name stems from the fact that after a microbe's cell wall is digested, membrane tension causes the cell to acquire a characteristic spherical shape.