In Some Cells, There Are Many Different Ion Electrochemical Gradients

question 42

Multiple Choice

In some cells, there are many different ion electrochemical gradients across the plasma membrane even though there are usually only one or two types of proton pumps present in the membrane. The gradients of the other ions are most likely established by which of the following?

• A) cotransport proteins
• B) ion channels
• C) pores in the plasma membrane
• D) passive diffusion across the plasma membrane

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