1.1 Flashcards
Phospholipids are _____________
Amphipathic
Phospholipids heads are ____________
Hydrophilic
Phospholipids tails are ___________
Hydrophobic
At low concentrations phospholipids in water form ___________
Monolayer
At higher concentrations they form ____________ and then eventually _____________
Micelles ; Bilayer
__________ influences fluidity of a membrane
Cholesterol
Phospholipids can move ______________ but THEY CANNOT ____________
Laterally, Rotate……. CANNOT FLIP TO THE OTHER LEAFLET
FRICKS LAW
Flux of solute = Permeabiliy coefficient (External Concentration - Internal Concentration)
Fricks law is only for ____________
Uncharged Particles
Passive transport happens through _____________
Facilitated diffusion
Driving force of transport is depended by
- Concentration
- Electrical
- Chemical gradient / potential
- Energy difference
Dominant Intracellular ion
K +
Dominant extracellular ion
Na + and Ca 2+
Membrane is at equilibrium when net force is ________
Zero
Types of passive facilitated diffusion
- Pores
- Channels
- Carriers
Pores are ___________
Always open
Channels are __________
Gated
Require secondary sensors and messengers for them to open
Carriers require __________
Very selective
Require saturation to a point for them to work
In other membranes of gram negative bacteria and mitochondria are ______________
Porins
Cytotoxic T lymphocytes kill their target cell __________
Perforin
Regulates traffic into / out of the nucleus
Nuclear Pore Complex (NPC)
Pores that are just large enough to allow water molecules too pass through
Aquaporins
Na + K + pump exists to make the cell ________
Electrogenic (Excess negative in the cell)
