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