And then those sugar molecules can either be broken down by the hydrolytic enzymes or they can be ingested directly into our cell wall. Now, another difference between our Gram negative and Gram positive is because our Gram negative contains this second phospholipid bilayer. That phospholipid bilayer contains special types of molecules known as lipopolysaccharides. So it contains lipopolysaccharides protruding from the membrane, which can protect the bacteria from being killed off by different types of drugs as well as antibodies found within our body. So basically, these types of bacteria can resist the different drugs that we develop in the laboratory to kill off the different type of bacterial cells found in our body. So basically, one important part that our cell envelope contains is the Peptidoglycan.