Uniporters and ion channels support facilitated transport across cellular membranes. Although both are examples of facilitated transport, the rates of ion movement via an ion channel are roughly $10^{4}-$ to $10^{5}$ -fold faster than the rates of molecule movement via a uniporter. What key mechanistic difference results in this large difference in transport rate? What contribution to free energy $(\Delta G)$ determines the direction of transport?
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The key mechanistic difference between ion channels and uniporters is that ion channels provide a continuous aqueous pore for ions to pass through, allowing for rapid diffusion, while uniporters undergo a conformational change to transport molecules across the Show more…
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Carrier proteins: a. mediate primary active transport. b. transport ions or molecules across the membrane without hydrolysis of ATP. c. have two classes: uniporters and symporters. d. utilize the gradient of one ion to drive the transport of another ion down its concentration gradient. e. provide translocation across the membrane only for molecules.
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A driving ion moving through a membrane channel in one direction gives energy to actively transport another molecule in the opposite direction. What is this process called? a. facilitated diffusion b. antiport transport c. symport transport d. primary active transport pump e. cotransport
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