Use the following information to answer the questions below. Cystic fibrosis is a genetic disease in humans in which the CFTR protein,which functions as a chloride ion channel,is missing or nonfunctional in cell membranes. -The CFTR protein belongs to what category of membrane proteins?
A)gap junctions B)aquaporins C)electrogenic ion pumps D)cotransporters E)hydrophilic channels