Bacitracin blocks the transport of nag and nam across the cytoplasmic membrane to the cell wall. like other antimicrobials that block cell wall synthesis, this would result in weak cell walls and

The answer is: cell lysis due to the effect of osmotic pressure

The cell membranes are important for microorganism because of it separate things outside cells and inside cells. This helps the cell to keep electrolyte and other useful things like carbohydrate and proteins. The cells could dump toxins and dangerous chemical that it produce outside the membrane so it won't damage organs inside the cells. 

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