1. Transport of specific solutes into or out of cells. 2. Enzymatic activity - sometimes catalyzing one of a number of steps of a metabolic pathway 3. Signal transduction - relaying hormonal messages to the cell. 4. Cell-cell recognition - allowing o

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1. 1. Transport of specific solutes into or out of cells. 2. Enzymatic activity - sometimes catalyzing one of a number of steps of a metabolic pathway 3. Signal transduction - relaying hormonal messages to the cell. 4. Cell-cell recognition - allowing o