Transport Proteins

Question 1

Three different types of Transport protiens

Answer 1

Channel
Gated
Carrier`

Question 2

Two types of molecule that can’t pass through membrane without transport protein.

Answer 2

Polar
Ions

Question 3

Def. Of channel protein

Answer 3

Functions thru hydrophilic channel

Question 4

Def. of carrier protein

Answer 4

Uses energy to change shape and bind to substance to “CARRY” it to the other side

Question 5

Gated proteins

Answer 5

They are channel proteins that opens its “gate” in response to stimuli.

Question 6

How does the aquaporin channel work?

Answer 6

The water travels to the HYDROPHOBIC part and reaches the narrowest part, then bonds to two nitrogen, then EXITS the cell.

Question 7

How does the Sodium channel work?

Answer 7

The sodium ion reaches narrowest section of the channel then the sodium gets hydrated with H20 to pass.

Question 8

Why can’t potassium pass through the sodium channel?

Answer 8

Simply to big to pass thru narrow part.

Question 9

How does the Potassium Channel work?

Answer 9

Channel narrows, so K+ is stripped of H20.

Question 10

How does the sodium Potassium pump work?

Answer 10

It is a type of Active transport that uses ATP that releases a phosphate group, then P-group binds to protein, it changes shape, and 3 Na+ exits the cell, then 2 K+ binds to protein, P-group is released, Protein changes shape and then 2 K+ enters the cell.

Question 11

What are 3 selectivity filters that determines if a molecule can pass through the transmembrane protein?

Answer 11

Size and Shape of Channel

Bonds between Channel & Molecule/Ions

Charge of Ions