Cell Membrane And Diffusion Flashcards
What is the cell membrane also called
The plasma membrane
What is the cell membrane made of?
Phospholipids,proteins,sugars and cholesterol
What is it called when the parts are able to move around?
Fluidity
What is the head of a phospholipid?
It has a glycerol and polar head
What is the tail of the phospholipid?
It has a fatty acid and nonpolar tail
What is another type of lipid that looks different from cholesterol?
Steroid
Or steroids polar or non-polar?
Nonpolar
What can steroids be?
Chemical messengers
What is the steroid that helps maintain the structure of the animal cell membrane?
Cholesterol
Prokaryotes and plants don’t have what, in there so membranes?
Cholesterol
What is the proteins role in the cell membrane?
Receptor(receives signals)
Transports protein(moves molecules across the membrane)
Channels(acts as a doorway)
Glycoproteins (acts as ID tags)
What can move through the cell membrane?
Small hydrophobic molecules and small uncharged molecules
What cannot pass through the cell membrane?
Large or polar molecules and ions
Concentration Gradient
The unequal distribution of particles in a given space
Equilibrium
The equal distribution of particles in a given space
What is the first characteristic of passive transport
It does not require energy
What is the second characteristic of passive transport
Movement of molecules from high to low concentration
What is the third characteristic of passive transport
It’s purpose is to reach equilibrium
What are the types of passive transport?
Diffusion, osmosis, facilitated diffusion
What is the description of diffusion?
The movement of any particle from high to low concentration
What can pass through the cell membrane during diffusion?
Only things that are nonpolar and uncharged molecules
What is the description of osmosis?
It is the movement of water from high to low concentration across a membrane
Hypotonic
Less solute
Isotonic
Equal concentration of solute
Hypertonic
More solute
What is the description facilitated diffusion?
It moves particles from high to low concentration across the cell membrane with the aid of special membrane transport proteins
What is facilitated diffusion for?
It is for larger or charged particles that requires a protein channel
