It is necessary to couple some biochemical reactions because individually some biochemical reactions have +ΔG and coupling them together makes helps to make the overall reaction -ΔG.
Reactions that have a positive value of Gibbs free energy, require additional energy to complete, which can be obtained when it is coupled with the hydrolysis of ATP.
Also, the biochemical reaction which has a negative value of ΔG is non-spontaneous in nature. For those to become spontaneous, the value of ΔG should be negative. The coupling of reaction makes their Gibbs free energy negative and makes them spontaneous.
Therefore it is necessary to couple biochemical reactions to the hydrolysis of ATP.
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