Cell membranes and transport Flashcards
1
Q
What is simple diffusion?
A
small soluble molecules move down the concentration gradient. It is a passive process.
2
Q
What is facilitated diffusion?
A
Substances cannot move through the bilayer so use intrinsic proteins to move
3
Q
factors affecting rate of diffusion
A
concentration gradient
thinner membrane
surface area
4
Q
endocytosis
A
plasma membrane folds inwards
plasma membrane engulfs material
vesicle formed from plasma membrane engulfs cell
5
Q
exocytosis
A
transports waste out of a cell in vesicles that fuse with the cell membrane
6
Q
co-transport
A
two different substances use the same carrier protein
7
Q
active transport
A
net movement of molecules from an area of low concetration to an area of high concentration
