Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
5 Cards in this Set
- Front
- Back
|
Plasma membranes |
●found around cells and some organelles ● they are partially permeable barriers ●made up of phospholipids in a bilayer & proteins ●Under an electron microscope you can see the bilayer as 2 dark bands & the distance across the membrane is 7 nm |
|
|
Fluid-Mosiac model |
The molecules in a membrane are not bonded together so there is some movement but it is relatively stable due to the nature of the phospholipid ●Singer & Nicholson proposed the model in 1972 Fluid: phospholipids and proteins move around each other Mosaic: Arrangement of proteins within the phospholipid bilayer |
|
|
Plasma membrane Components |
|
|
|
Role of membrane |
Within Cell: ●Separate cell components from cytoplasm (COMPARTMENTALISTION) ●Holding the components of metabolic pathways in place (eg mitochondria)
On surface ●Separate cell content from outside environment ●Cell recognition & signalling ●Regulating transport of materials into/out of cells |
|
|
Temperature and Membrane |
|
