Parts of the Plasma Membrane Flashcards
What is the arrangement of membrane proteins?
They are classified as Integral and Peripheral,
according to weather they are firmly embedded in the membrane.
What are examples of Integral Proteins in the plasma membrane?
This would include Ion Channels, Carriers, Receptors, Enzymes and Linkers.
What is a Ion Channel?
A Ion Channel is a Integral protein in the plasma membrane that forms a Pore across the lipped Bilayer.
This only allows a specific Ion to flow through the the membrane.
The Plasma membrane has these for commonly flowing Ions.
What does the Plasma membrane consist of?
The plasma membrane is made up of the Phospholipids and lipid bilayer, the Integral (transmitter) proteins, Peripheral proteins, Cholesterol and Glycoproteins.
What is a Peripheral Protein?
These are not as firmly embedded in the membrane and they are attached to the polar heads of the membrane lipid or to the integral protein on the inner or outer part of the membrane.
What is a carrier protein?
This is a Integral protein that transports specific substances across the membrane by undergoing a change in shape.
For example Amino Acids that are needed for protein synthesis enter the body through these transporters.
What is a receptor in the Plasma membrane?
This a Integral protein that recognizes specific ligand in the extracellular fluid and changes cell function in some way.
What is a Enzyme in the Plasma Membrane?
These are Proteins in the membrane that are Integral and Peripheral.
They Catalyze reactions inside or outside the cell (This is depending on what way the active side is facing).
For example in your intestines the lactose you eat is turned from Substrate to a product.
What are linker proteins in the Plasma membrane?
These are Integral and peripheral proteins.
They anchor filaments inside and outside the plasma, providing structural stability and shape for the cell may also help move the cell or link two cells together.
What are cell Identity markers? (Glycoprotein)
These are proteins that distinguish your cells from anyone else’s. A important class of these markers are the major histocompatibility proteins (MHC).
