Which describes the sodium-potassium pump and its relation to concentration gradients that exist across the cell membrane? (select all that apply.) it uses the energy in a sodium concentration gradient. it uses the energy in a potassium concentration gradient. it creates a sodium concentration gradient. it creates a potassium concentration gradient.

The correct statements are:

It creates a sodium concentration gradient.  

It creates a potassium concentration gradient.

Sodium-potassium pump is a ATP dependent transport (anti-porter) protein usually located in the plasma membrane of a cell.

It hydrolyses ATP in order to pump sodium and potassium in opposite directions each against its concentration gradient.

In one cycle, it export 3 sodium ions out of the cell and import 2 potassium ions into the cell. Hence, it moves a total of 1 positive charge across the cell membrane.

Thus it creates concentration gradient of both sodium and potassium which help in various functions such as conduction of action potential, transport of glucose etc.

the binding of the substrate is dictated by the shape of each molecule. side chains on the enzyme interact with the substrate in a specific way, resulting in the making and breaking of bonds.

hey there!

so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

hope this

tobey