In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. The gradients of the other ions are most likely accounted for by
A) cotransport proteins.
B) ion channels.
C) carrier proteins.
D) B and C only
E) A, B, and C

Question

In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane.  The gradients of the other ions are most likely accounted for by 
A) cotransport proteins. 
B) ion channels. 
C) carrier proteins. 
D) B and C only 
E) A, B, and C

alphadxg · Answer

C	
- Carrier proteins can serve to move ions into and out of a cell against an electrochemical gradient.  Ion channels serve to allow ions to flow down a gradient.