Diffusion can be passive or facilitated. Facilitated diffusion uses carrier proteins to obtain saturation kinetics of uptake. This drives the uptake of other species by secondary activetransport. Cell wall - Primary function is to prevent bursting from osmotic shock. Overall structure is analogous to girder-supported bridge.
Cell wall is a rigid, multilayered sheet.
Disruption of chemical structure of peptidoglycan reduces wall stability. These cells may still continue to grow and divide, and regenerate the cell wall under poper conditions. Gram negative cell thus actually has two cell membranes. As a result, gram negative bacteria are often less sensitive to certain antibiotics. Most pathogenic bacteria are gram negative.