A sodium-potassium pump
It involves a change in the shape of its carrier.
It moves substances against a concentration gradient.
It requires no energy input.
It requires a carrier protein.
Sodium into the cell.
Potassium into the cell.
Potassium out of the cell.
Both A and C.
Only through a lipid bilayer membrane.
From an area of low concentration to an area of high concentration.
Only in liquids.
From an area of high concentration to an area of low concentration.
Into the cell through the channel protein
Into the cell through the phospholipid
Out of the cell through the channel protein
Out of the cell through the phospholipid bilayer
Active transport .
Always remains greater inside a membrane.
Eventually becomes balanced on both sides of a membrane.
Always remains greater on the outside of a membrane.
Becomes imbalanced on both sides of a membrane.
Out of the cell; osmosis
Into the cell; osmosis
Out of the cell; active transport
Into the cell; active transport