Biology 105 Lecture 8

Front 1

The working cell

Back 1

Dead cell

Front 2

Fluid Mosaic Model

Back 2

Theory that explains the structure of membrane

Front 3

How many membrane proteins?

Back 3

6

Front 4

Enzymes

Back 4

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

Front 5

Transporters(active and channel)

Back 5

Allow specific ions or molecules to enter or exit the cell

Front 6

Receptors

Back 6

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

Front 7

Attachment protein

Back 7

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

Front 8

Junction protein

Back 8

Form intercelluar junctions that attach adjacent cells

Front 9

Gycoproteins

Back 9

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

Front 10

Membrane function

Back 10

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)

Front 11

Lipid Bi Layer

Back 11

Hydrophillic heads are in contact with the cytoplasm.

Front 12

Selective Permeability (what can pass through)

Back 12

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

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

Front 13

Selective Permeability (what cant pass through)

Back 13

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

Front 14

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

Back 14

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

Front 15

Diffusion

Back 15

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

Front 16

Concentration

Back 16

Number of molecules in a specific area

Front 17

Concentration Gradient

Back 17

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

Front 18

Equilibrium

Back 18

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