The processing requirements include successful completion of: 1  The application process, which includes a background and polygraph examination, a medical examination, a physical fitness evaluation, and a written examination; 2  24-26 weeks of intensive Academy training.
The cell membrane, being exposed to the outside environment, is an important site of cell-cell communication. As such, a large variety of protein receptors and identification proteins, such as antigens, are present on the surface of the membrane.
Receptor proteins are protein in the plasma membrane that binds to specific chemicals in the cell s external environment to regulate processes within the cell; for example, cell in the heart have receptor proteins that bind to adrenaline. chehre Â· 2 years ago.