Two types of membrane proteins Integral proteins and peripheral proteins Trans membrane protein structure Alpha helix from hydrogen bonds Functions of membrane proteins Transport- one with ATP one without it Enzymes- catalyze biochemical reactions; enzymatic activity Signal transduction Cell-cell recognition- how can a cell determine if the cell is of like kind or like species Intercellular joining- cells adhering to each other to form tissues and then organs when proteins join together Attachment- attach to cellular matrix to form an organ Cell adhesion and Recognition Cells bind to surface molecules on the plasma membrane Carbohydrates vary among Species Individuals Cell types Synthesis of membrane components Glycolipids Glycoproteins