allows only certain substances to pass through
concentration gradient
_________________ (attached to proteins or lipids) - have "antenna" to help cells identify or recognize other cells
________________ bring materials into the cell and receive signals from outside the cell
protection
liquid/fluid dissolving them =
_____________________= molecules are spread equally, the same concentration on either side of the membrane
__________________ - keeps cell membrane flexible
High concentration = ______________ solutes
low concentration = ____________ solutes
hydrophilic head made of _____
regulation
hydrophobic tail made out of ________
What are the major functions of the cell membrane?
solutes and solvent together make a _____________
_______________________=number of molecules in an area per unit of volume
What makes up the majority of the cell membrane?
Molecules dissolved in a liquid =
protection and regulation
fewer
equilibrium
carbohydrates
solutes
proteins
protects the cell from the outside environment
selective permeability
phosphates
solvent
phospholipids
fatty acids
concentration
solution
more
cholesterol
controls what can enter and exit the cell