 The Cf is considered as a  force of reaction, which keeps the physical state of the cell close to the ground state, where all enzymatic acts work perfectly well.
<clarity>  The Cf is considered as a  force of reaction, which keeps the physical state of the cell close to the ground state, where all enzymatic acts work perfectly well.
 The Cf is considered as a force of reaction, which keeps the physical state of the cell close to the ground state, defined here as a state where enzymatic acts work perfectly well.