Unit 1.3.a Flashcards
What is the fluid mosaic model!
A model the describes the structure of the cell membrane
Explain the role of hydrophobic regions in an integral protein that allow it to fit into a cell membrane
Regions of hydrophobic R groups allow strong hydrophobic interactions that hold integral membrane proteins within the phospholipid bilayer
What is an integral protein?
Integral membrane proteins interact extensively with the hydrophobic region of membrane phospholipids
What is a transmembrane protein?
An integral membrane protein which spans the entirety of the cell membrane
What is a peripheral membrane proteins?
Many peripheral membrane proteins interact with the surfaces of integral membrane proteins
How are peripheral proteins attached to the cell membrane
Peripheral membrane proteins have hydrophilic R groups on their surface and are bound to the surface of the membranes, mainly by ionic and hydrogen bond interactions
Some small molecules, such as oxygen and carbon dioxide, pass through the phospholipid bilayer by ____
Simple diffusion
What is facilitated diffusion?
The passive transport of substance across the membrane through specific transmembrane proteins
What are channels?
Multi-subunit proteins with the subunits arranged to form water-filled pores that extend across the membrane
What is a ligand gated ion channel?
Channels controlled by the binding of signal molecules
What is a voltage-gated channel?
A channel controlled by changes in ion concentration
What is the role of transporter proteins
Transporter proteins bind to the specific substance to be transported and undergo a conformational change to transfer the solute across the membrane
Transporters alternate between two conformations so that the binding site for a solute is sequentially exposed on one side of the bilayer, then the other
