The cell with a non-functional ATP synthase will be unable to synthesize ATP molecules.
ATP synthase is a protein molecule which is found within the mitochondria.
The role of ATP synthase is in the synthesis of ATP from free inorganic phosphate and ADP using the energy stored in the proton gradient set up when protons cross the inner mitochondrial membrane from the intermembrane space into the matrix.
During aerobic respiration, electrons are passed through electron carriers on the mitochondrial membrane, setting up a proton gradient which is used by ATP synthase for ATP synthesis.
Thus, a cell which has impaired ATP synthase function will be unable to synthesize ATP molecules.
In conclusion, ATP synthase is responsible for ATP synthesis.
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