Cell Membrane Structure Flashcards
What do cell membranes do
Control which substances enter and leave the cell and let some molecules in but not others,as they are partially permeable
How do substances travel across the cell-surface membrane
Diffusion,osmosis,or active transport
What proteins are scattered through the membrane
Channel proteins and Cartier proteins
What are gkyco proteins
Proteins which have a polysaccharide chain attached
What are all of the components of cell membranes
Protein,cholesterol,glycoprotein,glycolipid,phospholipids,protein channels
What does the phospho lipids bilayer do
It forms a protective barrier for the cell.it allows different environments to be maintained on either side of the cell
What does the bi layer do
The bilayer prevents water soluble/charged substances to pass into/out of the cell - meaning it is selectively permeable
What does the fulidity of the bilayer allow
It allows it to form vesicles,fuse with other membranes (phagocytosis)
What are surface proteins also known as and what do they do
Extrinsic proteins, and they are important for cell-to-cell recognition,can act as antigens or receptors
What is cholesterol important for
Stability,and regulates fluidity
What is a carrier protein
A carrier protein is a transport protein that is specific for an ion, molecule, or group of substances. Carrier proteins “carry” the ion or molecule across the membrane by changing shape after the binding of the ion or molecule.
What is a channel protein
A channel protein, a type of transport protein, acts like a pore in the membrane that lets water molecules or small ions through quickly.
What is cholesterol
A lipid that is an important component of cell-surface membranes. Excess in the blood can lead to atheroma
What is the fluid mosaic model
The name given to the structure of the plasma membrane as a result of the appearance brought about by the protein elements of the membrane being studded in the phospholipid bilayer and freely able to move within the membrane
What are glycolipids
Lipids with attached carbohydrate region that function in cell recognition and binding
