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18 Cards in this Set

  • Front
  • Back

The working cell

Dead cell

Fluid Mosaic Model

Theory that explains the structure of membrane

How many membrane proteins?



Some membrane proteins are enzymes. Enzymes maybe group to carry out sequential reaction.

Transporters(active and channel)

Allow specific ions or molecules to enter or exit the cell


Signaling molecules bind yo receptor proteins. Receptors proteins relay the message by activating other molecules inside the cell.

Attachment protein

Attach to the extracellular matrix and cytoskeleton. Help support the membrane and can coordinate external/internal changes

Junction protein

Form intercelluar junctions that attach adjacent cells


Serve as ID tags. Maybe recognized by membrane proteins of other cells.

Membrane function

Membrane structure gives it certain properties. Properties effect how things move in and out of cell. Lipid bi layer makes the membrane selectively permeable( selectivity what goes in/out)

Lipid Bi Layer

Hydrophillic heads are in contact with the cytoplasm.

Selective Permeability (what can pass through)

1. Small, non polar molecules like oxygen and carbon dioxide.

2. Water can slip through because it is small and relatively uncharged

Selective Permeability (what cant pass through)

Big molecules like sugar, proteins and charge molecules(H+. Cl-) They cant go through the hydrophobic region of the bi layer.

Transports( How do molecules and ions move in and out of cells?)

Depends on the molecule and other factors. Some molecules can simply diffuse in and out. This is one form called passive transport( NO ATP)


movement of molecules from a area of higer concentration to an area of low concentration. Dependent upon concentration


Number of molecules in a specific area

Concentration Gradient

When the number of solute molecules in one side is different than the other side


no concentration gradient exist. Solute molecules move down concentration gradient until equilibrium is reached.