Answer the following question given this paragraph: 

The electrochemical potential across a membrane determines the tendency of an ion to cross the membrane. The membrane may be that of a cell or organelle or other sub cellular compartment. The electrochemical potential arises from three factors:.


Q: The electrochemical potential across a membrane determines the tendency of an ion to do what?

 Choices:

- attach to the membrane

- move away from the membrane

- destroy the membrane

- cross the membrane

A:
cross the membrane
