Cell Membranes And Exchange Flashcards
What is responsible for what goes in and out of the cell
The cell membrane
What does mrs gren stand for
Movement Respiration Sende Growth Reproduction Excretion Nutrition
What are the 2 main parts that make up a phospholipid
A polar/phosphate head and a non polar/fatty acid tail
Why are the opra heads on outside of the membrane
Because the non opra tails and hydrophobic
When lots of phospholipids join together what does it make up
The phospholipid bilayer
How does the phospholipid bilayer structure change
The configuration will remain the same but individual phospholipids may swap places usually with one next to them. This movement increase the fluidity of the cell
What are the main structures of the fluid mosaic model
Phospholipid Cholesterol Channel protein Glycoproteins Glycolipid Extrinsic protein
What makes the membrane barrier more complete and gives membranes in eukaryotic animal cell more stability
Cholesterol
What acts as enzymes (photosynthesis in chloroplasts) and allows movement of some substances across the membrane
Channel protein
What is made of proteins and carbohydrates and acts as a cell recognition site
Glycoproteins
What us made of phospholipids and acts as a cell recognition site
Glycolipid
What do extrinsic proteins do
Give mechanical support to the membranes
What 3 substances are required to allow the transport of substances in and out of the cell
Oxygen for survival
Nutrients for aerobic respiration
Waste products produced by reactions within the cell
Name a reaction that roo duces waste products
Metabolism act…
What do you call a process that only relays on kinetic energy
Passive process
Like diffusion
What does equibriam mean
That there is no net movement of particle
Give an example of how cells try to ensure that equilibrium is not reached
Co2 is used In photosynthesis so that there is always an low concentration on the inside of the cell
Name 6 ways that can affect the rate if diffusion
PH Temperature Stirring the mixture Distance or length of diffusion pathway Differ ace in concentration Surface area
Why are fat soluble molecules allowed to simply pass through the bilayer
Because the membranes are made of phospholipids
How can channel proteins assist particles and molecules in getting across the bilayer
They form pores in the membrane which often only allow only one type of ion through and are gated to stop more getting in
How can carrier proteins assist in getting molecules through the bilayer
Shaped so that inky specific molecule can fit I. Them and they then change shape to allow the molecule to pass through the carrier protein
What is flicks law
Flick law is the rate if diffusion which is concentration gradient times the surface area, divided by the length if the diffusion pathway
When a substance requires help form a protein to get across membrane what kind of diffusion is this known as
Facilitated diffusion
What is the net movement of water across a partially permeable membrane called
Osmosis
