ch 4 part 4 reviews Flashcards
The outer boundary of the cell
plasma membrane
Cells are surrounded by ___________
plasma membrane
plasma membrane made up of
two layers that are filled with
a variety of pores and molecules and channles
plasma membrane function :
-hold contents of cell in place
-takes in food and nutrient
-aid in building and exporting molecules
-allows interaction with the enviroment and neighboring cells
-protects the cell
-control the content of cytoplasm
-sense molecules and other cells in the environment
plasma membrane characteristic :
1-binds to cytoplasm and extracellular matric
2-fluid mosaic
3-selective permability
Plasma Membrane Structure :
Made up primarily of phospholipids
Phosphate “head” =
Fatty acid “tails” =
plsama membrane head :
-polar or attracted to water or hydrophilic
-composed of glycerol linked to phosporus-containing molecules
-face out
-extend toward the intracellular and extracellular
plasma membrane tail
-nonpolar or no attracted to water and hydrophobic
-composed of carbon-hydrogen chain
-face in
-directed away from them
Plasma Membrane Structure :
Phospholipids will arrange themselves into a bilayer in solution
how many layers in phospholipids ?
2
peripheral membrane protein
attached to outside and inside of the membrane
integral membrane protein or imp
1-integrated into the membrane
2-have hydrophilic and hydrophobic region
membrane carbohydrate :
-Found on the exterior or interior of the membrane
-hydrophilic
-glycoprotein and glycolipid
molecules within the cell membrane___________,________,___________are ___________in plasma membrane but many can float around because they are not always ________in place :
-carbohydrate
-lipid
-protein
-are embedded
-anchored
provide a fingerprint for identification by other cell
carbohydrate chain
