Final answer:
Peripheral membrane proteins are only temporarily associated with the membrane and can be easily removed. They can be attached to integral membrane proteins or stick to a small portion of the lipid bilayer by themselves. Peripheral membrane proteins are often involved in cell signaling and associated with ion channels and transmembrane receptors.
Step-by-step explanation:
Peripheral membrane proteins are proteins that are only temporarily associated with the membrane. They can be easily removed, which allows them to be involved in cell signaling. Peripheral proteins can also be attached to integral membrane proteins, or they can stick into a small portion of the lipid bilayer by themselves. Peripheral membrane proteins are often associated with ion channels and transmembrane receptors. Most peripheral membrane proteins are hydrophilic.