What is the definition and function of intrinsic and extrinsic proteins?
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Answer:
Membrane proteins are either extrinsic or intrinsic. Extrinsic membrane proteins are entirely outside of the membrane, but are bound to it by weak molecular attractions (ionic, hydrogen, and/or Van der Waals bonds). Intrinsic membrane proteins, the class we are mainly interested in, are embedded in the membrane. Many of them extend from one side of the membrane to the other and are referred to as transmembrane proteins.
Cells are constantly pumping ions in and out through their plasma membranes. In fact, more than half the energy that are bodies consume is used by cells to drive the protein pumps in the brain that do nothing else but transport ions across plasma membranes of nerve cells. How can ions be transported across membranes that are effectively impermeable to them?
Cells contain proteins that are embedded in the lipid bilayer of their plasma membranes and extend from one side of the membrane through to the other. Such transmembrane proteins can function to effect ion transport in several ways. But how can they cope with the energetically highly unfavorable situation in which an ion must pass through the hydrophobic inner layers of the plasma membrane?
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Explanation:
Answer:
Explanation:
The intrinsic proteins are the integral membrane proteins. The have a function of transport of water molecules and the neutral solutes within the cells. The extrinsic proteins are the membrane proteins these remain attached to the inner phospholipid layer. These proteins also facilitate the transport of molecules these act as receptor. These are attracted by the cell membrane by weak attaction of molecules which can be ionic or through hydrogen bonding or vander waal bonds.