And what is required for secondary active transport?
I suspect (but don't know for sure):
-A port of some kind (either symport or antiport)
-A substance going down it's concentration gradient through the port (that is somehow required to "bring along" the substance being transported by secondary active transport in either direction)
-Maybe ATP ----- Is ATP ALWAYS indirectly required, or can another substance or series of events indirectly power secondary active transport?
I suspect (but don't know for sure):
-A port of some kind (either symport or antiport)
-A substance going down it's concentration gradient through the port (that is somehow required to "bring along" the substance being transported by secondary active transport in either direction)
-Maybe ATP ----- Is ATP ALWAYS indirectly required, or can another substance or series of events indirectly power secondary active transport?