Answer:
The right word to fill the blank space is TRANS MEMBRANE PROTEINS.
Explanation:
Membrane proteins are proteins that are found in the cell membranes of living organisms. There are three major types of membrane proteins, these are integral, peripheral and lipid anchored proteins. These proteins perform diverse functions in the transport of materials in and out of the living cells.
The integral proteins refer to those proteins that are permanently anchored to the cell membranes. Integral proteins are attached to the cells in various ways, some integral proteins are attached to only one side of the membrane and do not span across the whole membranes while some span the whole phospholipid bilayers one or more times. The integral membrane proteins that span the phospholipid bilayer one or more times are called TRANS MEMBRANE PROTEINS.
