structure and fonction of cellular membrane Flashcards
(13 cards)
what membrane surrounding the whole cell and certain organelles
plasma membrane
what are the fonction of the plasma membrane ?
1-selectivaly isolate the cells inner contents from the external environment .
2-regulate the flow of Materials into and out of the cell.
3-allows interaction with other cells and environment .
4- regulate some biochemical reactions.
5-helps attaches cells together.
4 MAJOR componants of the cellular membrane
- 2 layers of phospholipids
- proteins
3.carbohydrates
4.cholesterol (steroid lipid)
what is the structure of the cellular membrane called ?
fluid mosaic model
the 2 layers of phospholipids form what ?
lipid bilayer in witch other componence get embeded
cellular membrane structure and function ?
1-selectivaly isolate the cells inner contents from the external environment .(phospholipids have hydrophobic barriors)
2-regulate the flow of Materials into and out of the cell.(proteins)
3-allows interaction with other cells and environment .(proteins)
4- regulate some biochemical reactions.
5-helps attaches cells together.(proteins)
4 main classes of membrane proteins ?
- Adhesion proteins
- Enzymes
3.Transport proteins
4.receptor proteins
what are they distinguished by?
what they do
fonction of Adhesion proteins?
Attach the cell to other cells or non-living protein
fonction of Enzymes?
catalyze chemical reactions that occur at a cell membrane
fonction of Transport proteins?
move substances across the membrane that would not normally be able to cross on their own.
2 types of Transport proteins?
- carrior protein
- channel protein
fonction of receptor proteins?
- cell cell comunication
2.recognize and bind to specific signaling molecules found in the extracellular environment.
2.relay message to relevant locations in the cytoplasm - some also transport large amount of specific substances across the membrane simultaneously .
