Problem: 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/molIn the cell the reaction is coupled to the hydrolysis of ATP, shown below.ATP + H2O → AMP + PPi                           ∆G = -31.6 kJ/molThe net ∆G of the coupled reaction is __________. A. -5.5 kJ/molB. -11.2 kJ/molC. +5.5 kJ/molD. +11.2 kJ/mol

FREE Expert Solution

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. 

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Problem Details

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

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