Coupled reactions like this are basically a pair of reactions, one being endergonic with the other being exergonic. These reactions are coupled so that the overall reaction would be exergonic, and thus, spontaneous.
Fireflies are flying beetles that flash light during mating rituals. The enzyme luciferase is involved in the illumination process and is an ATP requiring reaction. The coupled reactions are described below:
luciferin + O2 → oxyluciferin + light ∆G = +26.1 kJ/mol
In the cell the reaction is coupled to the hydrolysis of ATP, shown below.
ATP + H2O → AMP + PPi ∆G = -31.6 kJ/mol
The net ∆G of the coupled reaction is __________.
A. -5.5 kJ/mol
B. -11.2 kJ/mol
C. +5.5 kJ/mol
D. +11.2 kJ/mol
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the ATP concept. You can view video lessons to learn ATP. Or if you need more ATP practice, you can also practice ATP practice problems.
What professor is this problem relevant for?
Based on our data, we think this problem is relevant for Professor Schul's class at MIZZOU.