Plasma membrane and cell wall
what makes up the plasma membrane
Phospholipids with embedded proteins
What can pass through
gases, lipids, and small polar molecules can freely move across the lipid bilayer.
what cant pass through on its own
hydrophobic interior of the lipid bilayer prevents ions as well as charged or polar molecules from diffusing freely across the plasma membrane. Furthermore, many macromolecules such as proteins and polysaccharides are too large to cross the plasma membrane on their own
what does it mean that the plasma membrane is semi permeable
it only allows certain things to pass through
what does the cell wall do
outside of plasma membrane, maintains cell shape
what does the plasma membrane do
separates inside of the cell from the enviornment, maintains intercellular homeostasis