IB Bio 1.4 Notes - Membrane Transport

IB Bio 1.4 Notes

Multiple Choice

Why do you the cell membrane forms an effective barrier for a cell?

• They are polar therefore do not dissolve

• The hydrophilic heads within the cell membrane form an effective barrier

• The lipid layer is a bilayer

• membrane proteins

Multiple Choice

Does diffusion use energy

• yes

• no

Open Ended

What does selectively permeable mean?

Open Ended

What is facilitated diffusion

Open Ended

Compare and contrast the molecules that are transported through simple diffusion and facilitated diffusion (1 of each)

Open Ended

Define diffusion and outline simple diffusion

Multiple Choice

What is osmosis?

• The movement of molecules from high to low concentration

• the movement of salt molecules from high to low concentration only

• them movement of water molecules from high to low concentration only

• None of the above