so they can fit in our body

they need to exchange materials across plasma membrane

they need to exchange materials through the nucleus

none of the above

controls traffic in and out of cell

creates a flexible, thick boundary

phospholipid bilayer

embedded proteins in the structure

to control what goes in and out of the cell

to shield ions and hydrophilic molecules as they pass through the center of the membrane

to transport molecules into or out of the cell

to allow proteins to flow effectively