List two characteristics that almost all transport proteins share
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They're large transmembrane proteins,
and therefore have "hydrophobic regions" which insert in the membrane, and hydrophilic regions some of which are sticking out of the cell and some of which are sticking into the cell.
and therefore have "hydrophobic regions" which insert in the membrane, and hydrophilic regions some of which are sticking out of the cell and some of which are sticking into the cell.