membrane transport

gating opening is

selective and controlled

active transporters require

input of energy

passive transporters require

NO input of energy

passive transporters are

• slow

• highly selective

• saturable

PTs move molecules

DOWN their conc gradient

PTs port are

uniport

example of PT

ligand-gated channels

ATs can be either

primary or secondary

PrimTs move molecules

UP their conc gradient

PrimT pumps are

• slow

• selective

• saturable

types of PrimT pumps

• p-type

• F+V type

• ABC

PrimT ports are

uni/sym/antiport

PrimTs require

ATP hydrolysis = conformational change = molecules move to the opposite side

coupled transporters are

secondary

for transport to occur in coupled transporters

BOTH solutes must be present

coupled transporter ports are

sym/antiport

symport

molecules travel in the same direction

antiport

molecules travel in opposite directions

ion channels are

passive transporters