Plasma Membrane Flashcards
The basic structural framework the plasma membrane
Lipid Bilayer
The Lipid bilayer is made up of… (include ratios)
Phospholipids 75%
Cholesterol 20%
Glycolipids 5%
To have both polar and non polar sides is to be
amphipathic
The phosphate containing head is… (reaction to water )
Hydrophilic ( Polar )
The two long tails are… ( reaction to water )
Hydrophobic ( non polar )
Functions of the plasma membrane ( 4 functions )
- Acts as a barrier separating the inside from the outside of the cell
- Controls the flow of substances into and out of the cell.
- Helps identify the cell to other cells ( e.g., immune cells )
- Participates in intercellular signaling.
Proteins that span the entire lipid bilayer and protrude into both the cytosol and extracellular fluid are called.
Integral Protein ( AKA transmembrane protein )
Proteins that are attached to the polar side of the bilayer only is called a
Peripheral protein
Integral protein which have a carbohydrate group attached to it is called a
Glycoprotein
Integral protein that forms a pore through which a specific ion can flow to get across the membrane
Ion Channel
An integral protein that transport a specific substance can cross by undergoing a change in shape
Carrier
An integral protein that recognizes specific ligand and alters the cell’s function in some way
Receptor
a protein which can be both integral or peripheral that catalyzes reaction inside or outside the cell
Enzyme
a protein which can be both integral or peripheral which anchors filaments inside and outside the plasma membrane , providing structural stability and shape for the cell. may also participate in movement
Linker
Distinguish your cells from anyone else’s
Cell identity marker
