Movement Of Molecules Across The Membrane Flashcards
What’s a fluid mosaic model
A model that describes the structure of the cell membrane
LEARN HOW TO LABEL THE PHOSPHOLOID BIYLAER
What do regions of hydrophobic R groups allow
String hydrophobic interactions that hold integral membrane proteins within the phospholipid bilayer
What do integral membrane proteins do
-Interact extensively with the hydrophobic region of membrane phospholipids
-some are transmembrane proteins so they spam the entirety of the cell membrane
What are peripheral membrane proteins
Have Hydrophilic R groups on their surface and are bound to the surface of membrane mainly by ionic and hydrogen bond interactions
What do many peripheral membrane proteins do
Interact with the surfaces of integral membrane proteins
What is the phospholipid bilayer
Is a barrier to ions and most uncharged polar molecules
How to small molecules pass through the bilayer
Oxygen and c02 pass through by simple diffusion
What is facilitated diffusion
The passive transport of substances across the membrane through specific transmembrane proteins
Why do different cell types have different channels and transporter proteins
To perform specialised functions
What are channels
Multi subunit proteins with the subunits arranged to form water filled pores that extend across the membrane
What are most channel proteins
Highly selective meaning they let very few types of molecules pass through
What do some channel proteins do
They are gated and change conformation to allow or prevent diffusion
What are ligand gated proteins controlled by
The binding of signal molecules
What are voltage gated channels controlled by
Changes in ion concentration
