Which type of transport moves two molecules in the same direction across a membrane?
Coupled transport nomenclature systematically describes stoichiometry and directionality of substrates moved by single transmembrane protein complex operating via alternating access. Uniport category transports single molecular species in one direction without coupling to another solute, exemplified by GLUT1 glucose uniporter moving glucose down gradient, voltage-gated potassium channel Kv allowing potassium efflux, and mitochondrial ADP/ATP translocase albeit antiport. Symport, traditionally called cotransport, moves two or more different molecules simultaneously in same direction across memb
Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 11: Symport and Antiport – Coupled Transport Classification.
