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
helps the membrane retin flexibility
cholesterol
binds to external chemicals that regulate process within the cell
receptor protein
provide fingerprint for identification by other cell
recognition protein
provise passageway for molecules through cell
transport protein
accelerate intracellular and extra cellular reaction
membrane enzyme
