Which of the following is a common, defining feature of membrane-bound active ion transporters?

Which of the following is a common, defining feature of membrane-bound active ion transporters?

Which of the following is a common, defining feature of membrane-bound active ion transporters?



  1. All transporters are electrogenic.
  2. All transporters transport two or more different ions.
  3. All catalyze the conversion of ATP to ADP.
  4. All are able to move at least one ion against its concentration gradient.
  5. All of the above

Answer: 4