Question

Can someone give me a summary of what a plasma membrane is?

Answer 1

Like its structure/ functions ect..

Answer 2

Sure

-Selectively permeable - it allows some substances to cross the barrier easier than others
-Phospholipid bilayer - It provides a hydrophillic barrier from the environment. Hydrophilic molecules cannot easily enter the cell due to the nonpolar lipid tail. However, hydrophobic molecules can enter easily.
-There are proteins embedded throughout the membrane that can act as transport channels or also act as receptors to ligands.

In one sentence: the Plasma membrane is present in all cells and selectively considers what should go in and out of the cell, based on polarity and other factors.