The Cell 

PHOSPHLIPIDS

________: provide a hydrophobic barrier that separates the cell from its liquid environment.

CHOLESTEROL

________: plays a role in membrane fluidity, prevents water soluble molecules from diffusing across.

CARBOHYDRATES

________: crucial for cell to cell recognition.

PROTEINS

________: acts as transport channels by molecular receptors (ligands: Integral.

Water

________ is special and in order to cross, have to go through aquaporins.

SODIUM POTASSIUM PUMP

________: moves 3 + NA+ out and 2 K+ into the cell to maintain homeostasis.

Active transport

________ uses energy to move solutes against their gradients.

ENDOCYTOSIS

________: essentially the reverse of exocytosis, the cell forms new vesicles from the plasma membrane.

ISOTONIC

________: n net movement of water across the plasma membrane.

EXOCYTOSIS

________: vesicles from the cell's interior fuse with the cell membrane and expel their contents.

Cellular membranes

________ are fluid mosaics of lipids and proteins.

Passive transport

What is diffusion of a substance across a membrane with no energy investment? Answer with a single words or term.

MEMBRANE POTENTIAL

________: is the difference in electric charge across a membrane and is expressed in voltage.

NONPOLAR MOLECULES

________: able to pass the bilayer easily.

plasma membrane

What is selectively permeable, meaning it allows some substances to cross more easily than others? Answer with a single words or term.