Diffusion of a single solute from one side of the membrane only
(1 in)
Define ANTIPORTER
Diffusion of one solute and simultaneously or sequentially, a second solute in the opposite direction
(1 in 1 out)
What causes cystic fibrosis?
A defect in the gated channel protein that normally transports Cl- ions
The protein is called CYSTIC FIBROSIS TRANSMEMBRANE REGULATOR (CFTR)
Describe ACTIVE TRANSPORT
ATP is used to pump substances against their gradient in order to maintain a certain concentration.
(i.e.- Na/K pump keeps Na outside and K within the cell)
Describe how the sodium/potassium pump works
What is RECEPTOR-MEDIATED ENDOCYTOSIS?
A process by which cells internalize molecules (endocytosis) by the inward budding of plasma membrane vesicles containing proteins with receptor sites specific to the molecules being internalized
What are the 3 main purposes of EXOCYTOSIS?
1) Restore certain amounts of plasma membrane
2) Secretion
3) Integral proteins that were interacting with the interior of the cell are now displayed at the cell surface.