The plasma membranes of polarized epithelial cells, such as those found in thetubules of the nephrons in the kidney, are divided into apical and basolateraldomains. How are these two domains different and how do the differencesarise? How do transmembrane proteins affect the function of epithelial cells inthe proximal convoluted tubule(PCT)? Compare the structure and function of the cells in the PCT with the structure and function of the cells in the collecting duct.