Explanation:
This is because there are varied cell receptor types which recognize electrical signals, and hundreds of different signal molecules and allow the entry of substances into the cell. Each receptor-channel interaction may be specific to certain molecules, allowing for only their passage through the transport protein into the cell.
Further Explanation:
Proteins are structural support molecules comprised of long chains of amino acids joined via peptide (CONH) bonds; these are 20 specific units that are arranged into several macromolecules. Amino acids are absorbed through digestion and are incorporated into the body’s cells to build and repair organs, muscles, signal molecules and an alternative energy source.
Transmembrane proteins are embedded within the membrane from the extracellular fluid to the cytoplasm, and are sometimes attached to glycoproteins (proteins attached to carbohydrates) which function as cell surface markers. Carrier proteins and channel proteins are the two major classes of membrane transport proteins; these allow the transport of large molecules called solutes (including essential biomolecules) to cross the membrane. Carrier proteins (also called carriers, permeases, or transporters) bind the specific solute to be transported and undergo a series of conformational changes to transfer the bound solute across the membrane. Others cross the membrane through the process of endocytosis, which utilizes membrane-bound organelles for transport.
In specific cell types, collected proteins may function as a unit called an organelle. Some organelles are bound by membranes like those that make up the external structure of the cell, with varying compositions of phospholipids and proteins.
Learn more about membrane components at brainly.com/question/1971706
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