A semipermeable membrane is a membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion." Transmembrane proteins allow specific molecules/ions to pass through the cell membrane.
A transmembrane protein (TP) is a protein that goes from one side of a membrane through to the other side of the membrane. Many TPs function as gateways or "loading docks" to deny or permit the transport of specific substances across the biological membrane, to get into the cell, or out of the cell as in the case of waste byproducts.
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A semipermeable membrane is a membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion." Transmembrane proteins allow specific molecules/ions to pass through the cell membrane.
A transmembrane protein (TP) is a protein that goes from one side of a membrane through to the other side of the membrane. Many TPs function as gateways or "loading docks" to deny or permit the transport of specific substances across the biological membrane, to get into the cell, or out of the cell as in the case of waste byproducts.
The cell membrane and specific transporters.
Some materials can traverse the membrane on their own and some need a suitable "doorway".