Membrane proteins that bind to signal by which cells communicate are called receptors are generally transmembrane protein.
When the protein presents an internal signal sequence (SSI), this sequence, in addition to directing the transport of the translational complex to the REG, will also act as an SPT, with the carboxy-terminal portion of the protein facing the lumen. from the reticulum or into the cytosol.
in this case, many transmembrane proteins function as gateways to permit the transport of specific substances across the membrane.
See more about transmembrane proteins at brainly.com/question/3167745
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