Question

where does energy required for active transport come from?

Answer 1

Secondary active transport, is transport of molecules acroos the cell membrance utilizing energy in other forms than ATP. This energy comes from the electrochemical gradient created by pumping ions out of cell.

Answer 2

The energy for the active transport comes from different sources depending on which type of active transport it is.

If it is active transport then it is taking the energy directly from the breakdown of the ATP.

The secondary active transport takes the energy from the ionic concentration deviation on both sides of the membrane.