Membrane Proteins Flashcards
(12 cards)
What are transport proteins?
Transport proteins help move substances in and out of the cell.
What are receptor proteins?
Receptor proteins are important in the transfer of extracellular signals into the cell.
What is the role of enzymes in membranes?
Some enzymes are tightly bound to membranes, including those responsible for aerobic oxidation reactions.
What is the Fluid-Mosaic Model?
The fluid-mosaic model is the most widely accepted description of biological membranes.
What does the term ‘mosaic’ imply in the Fluid-Mosaic Model?
The term mosaic implies that lipid and protein components exist side by side without forming an intermediate substance.
What is the basic structure of biological membranes?
The basic structure is that of a lipid bilayer with proteins embedded in it.
What are lipid rafts?
Lipid rafts are assemblages of sphingolipids, sterols, and membrane proteins that serve as building blocks for membrane specificity.
How do membrane proteins move?
Membrane proteins can move laterally within the lipid bilayer.
What is the appearance of the interior of a membrane when viewed under an electron microscope?
The interior has a granular appearance due to the presence of integral membrane proteins.
What are integral proteins?
Integral proteins are components of a membrane that mediate the entry of specific substances into a cell.
What are peripheral proteins?
Peripheral proteins are associated with one side of the membrane.
What is the function of receptor proteins?
Receptor proteins have specific binding sites for extracellular substances.
