Membrane Notes Flashcards
Define glycoproteins function.
Combine with carbohydrates to make chemical receptors
What are the six functions of the plasma membrane?
- Hold cell together
- Controls what enters & exits
- Protects cell
- Allow the cell to recognized & be recognized
- Bind other cells & molecules
- Sites biochemical reactions
Define cholesterols function.
Affects membrane fluidity at different temperatures
Define channel / carrier protiens.
Passive transport across the membrane
Define protein pumps.
Hormone binding and recognition
Define receptor proteins.
Active transport across the membrane
Define enzymes.
Used in cell surface reactions
Define adhesion proteins.
Binding cells together
Define neurotransmitter receptors.
Communication between cells
What part is hydrophilic and what part is hydrophobic?
Polar head // hydrophilic
Tail // hydrophobic
Why are hydrophobic & hydrophilic properties of a bilayer able to maintain a membrane structure?
Because the are attracted to other positive charged molecules allowing the membrane to combine with other positive charges as in Hydro phobic properties are the tales repelling for positive charges which results in stopping ions to pass through the membrane
Define selectively permeable.
It’s like a net movement (overall movement) in which particles are moving all the time
Defined diffusion.
Passive net movement of particles from high and low concentration (when particles pass through without energy from high in the low concentration)
Define osmosis.
Passive movement of molecules of water from areas of low to high solute concentration (when water passes through)
Define solute.
Substance dissolved in water
Define solvent.
Substance that dissolves a solute
Define solution.
Combination of solute and solvent
What are four ways to maximize the rate of diffusion?
Concentration gradient
Surface area
Length of diffusion path
Define uniport.
One molecule passes through
Define symport.
When to molecules pass through
Define antiport.
When two molecules pass at the same time but in different directions
Define macromolecule.
Multiple molecules (an example of this would be multiple proteins produced in the cell)
Define vesicle.
A small sac filled with air or a fluid
Define exocytosis.
Export of macro molecules from cell (send)
