Cell Membranes

HideShow resource information
What do cell membranes do?
Membranes control what passes through them
1 of 16
What are membranes at the surface of cells called?
Plasma membranes
2 of 16
What are plasma membranes?
Barrier between cell and environment, controlling which substances enter and leave the cell
3 of 16
Describe plasma membranes
Partially permeable, substances can move across by osmosis, difusion and active transport, they allow cell communication
4 of 16
Describe membranes within cells
Barrier between organelle and cytoplasm, form vesicles to transport substances
5 of 16
What are cell membranes made up of?
Lipids, proteins and carbohydrates
6 of 16
Structure of cell membranes
Fluid mosaic structure. Phospholipid bilayer, cholesterol molecules present, protein molecules, glycoproteins, glycolipids
7 of 16
Function and structure of phospholipid bilayer
Forms a barrier to dissolved substances, Hydrophilic head, hydrophobic tail,
8 of 16
Function and structure of cholesterol
Gives the membrane stability. Type of lipid, cholesterol molecules fit between phospholipids, they bind to hydrophobic tails
9 of 16
Function and structure of proteins
Control what enters and leaves the cell. Some form channels which allow small, charged proteins through. Carrier proteins transport molecules and ions across the membranes by active transport.
10 of 16
Function and structure of glycolipids and glycoproteins
Act as receptors for messenger molecules, stabilise the membrane by forming hydrogen bonds with surrounding water molecules. They act as receptors for cell signalling. Antigens
11 of 16
What is cell signalling?
How cells communicate with eachother
12 of 16
How do cells communicate with eachother?
One cell releases a messenger molecule, this travels to another cell, binds to receptor on cell membrane
13 of 16
How can membrane permeability be tested in the lab?
Beetroot experiment
14 of 16
How does membrane permeability change with temperature?
Highly permeable at -0 an 45+
15 of 16
What does increasing the concentration of the solvent do?
Increase membrane permeability
16 of 16

Other cards in this set

Card 2

Front

What are membranes at the surface of cells called?

Back

Plasma membranes

Card 3

Front

What are plasma membranes?

Back

Preview of the front of card 3

Card 4

Front

Describe plasma membranes

Back

Preview of the front of card 4

Card 5

Front

Describe membranes within cells

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cell Membranes resources »