Lipids and Biomembranes

ID #2183

Why is the bond between a peripheral protein and integral membrane protein non-covalent? I understand that the bonding between the R Groups have the ability to be ionic, but wouldn't hydrogen bonding and Van der walls forces be considered covalent? Another question is, do transmembrane proteins just classify peripheral and integral membrane proteins or are they a specific type of protein that lies in the membrane?

The only type of covalent bonds are bonds in which electrons are shared. Ionic, hydrogen, Van Der Waals and hydrophobic interactions are not covalent. 

A transmembrane proteins are a type of integral membrane protein. I am sure that there are some levels of classification because the functions of membrane proteins are vast. 

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