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30 Cards in this Set

  • Front
  • Back
The model that describes the cell membrane
fluid mosaic model
The components of the cell membrane
phospholipids, carbohydrates, proteins, cholesterol
The most predominant part of the cell membrane
carbohydrate attached to a protein
carbohydrate attached to a lipid
function of cholesterol in the cell membrane
provide stability and fluidity to the membrane
the number of layers of phospholipids in the cell membrane
function of proteins in the cell membrane
signalling, cell recognition, transport, enzymatic
function of carbohydrates in the cell membrane
cell recognition
The 3 types of transport across the cell membrane
1) diffusion 2) transport by carriers 3) endo/exo-cytosis
The 2 types of diffusion
1) simple diffusion 2) osmosis
What particles move by simple diffusion across a cell membrane?
small, non-polar molecules such as gases
What particles move by osmosis across a cell membrane?
What is needed in order to allow diffusion to occur?
A concentration gradient (difference in concentration of a particle between 2 sides)
What are factors that affect diffusion rate?
1) particle size 2) temperature 3) concentration difference between sides
Define tonicity
The amount of solute in a solution
A lot of solute in solution
A little amount of solute in solution
The same amount of [solute] when comparing 2 solutions.
Which way will water osmose when comparing 2 solutions (hyper and hypo- tonic)?
water will move from hypotonic solutions to hypertonic solutions
Osmotic pressure
The pressure created by the movement of water from one area to another
What are the two types of transport by carriers?
1) facilitated transport 2) active transport
Facilitated transport
The movement of particles that are too large or polar across the cell membrane, down their concentration gradient with the aid of a protein channel.
Active transport
The movement of particles (small, large, polar & nonpolar) against their concentration gradient with the aid of a protein channel/pump AND ATP
2 types of Endocytosis
1) pinocytosis 2) phagocytosis
The movement of large particles or a bulk of small particles INTO the cell; requires energy
Cell drinking; movement of large amounts of little things into the cell at once
Cell eating; movement of large molecules into the cell
The movement of large molecules or large amounts of small molecules OUT of the cell at once; requires energy
Solution is made up of
solute (like salt) + solvent (like water)