Where can proteins be found when part of a plasma membrane?

Peripheral membrane proteins are found on the outside and inside surfaces of membranes, attached either to integral proteins or to phospholipids. Unlike integral membrane proteins, peripheral membrane proteins do not stick into the hydrophobic core of the membrane, and they tend to be more loosely attached.

Explanation:

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves