Capitol Report: Iranâs Global Threat. This week, I voted to stop the dangerous deal the Obama Administration negotiated to lift sanctions on Iran. I voted to protect Americans from the global threat posed by a nuclear Iran, because this is not a Republican issue or Democrat issue; this is an American security issue.
Cell Membrane Structure. The cell membrane is primarily composed of a mix of proteins and lipids. Depending on the membraneâs location and role in the body, lipids can make up anywhere from 20 to 80 percent of the membrane, with the remainder being proteins.
Functions of the Cell Membrane. 1. Mechanical Structure (a) Defines/encloses the Cell. A cell membrane encloses and defines the cell. There are different ways to express this, e.g. 1  The cell membrane maintains the physical integrity of the cell.