Question

Simultaneously coupled reactions have a common _.

_ is often coupled to endergonic reactions in cells.

Answer 1

Simultaneously coupled reactions have a common energy source, often ATP, which is coupled to endergonic reactions in cells.

Step-by-step explanation:

Simultaneously coupled reactions have a common energy source. In cells, endergonic reactions, which require energy input, are coupled to exergonic reactions to make them energetically favorable. This coupling is often achieved through the energy-supplying molecule called adenosine triphosphate (ATP).