Eukaryotes and Prokaryotes

Structure of the plasma membrane

Bilayer, mostly phospholipids

Boundary of the cell

Function of plasma membrane

Allow communication with the external environment

Selectively permeable

What do receptor proteins in the plasma membrane allow?

The cell to receive signals from the environment and pass them on to the inside of the cell

What do transport proteins in the plasma membrane allow?

Small molecules, such as ions, to enter and exit the cell

The flexibility of the plasma membrane allows

Cell growth and cell movement

Structure of phospholipids

Glycerol

Phosphate

Two fatty acid chains

Hydrophobic head or tail?

Tail

Hydrophilic heads or tails?

Head

Amphipathic

Molecules that have both hydrophobic and hydrophilic properties

Is the lipid ilaer 2D or 3D?

2D

What are the hydrophilic heads exposed to?

Water on the outside of the membrane

Name four roles of membrane proteins

Transporters = which transport tridents, metabolites and ions across the bilayer

Anchors = ache thee membrane to macromolecules

Receptors = detect chemical signals in the environment and transmit them to the interior of the cell

Enzymes = catalysing specific reactions