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With reference to reactive oxygen species (ROS), which of the following statements, if any, is false?
a) ROS are an inevitable consequence of the chemical reactions that occur in cells and are formed by the incomplete one-electron reduction of oxygen.
b) Common examples of ROS include hydrogen peroxide (H2O2), superoxide anions (O2-) and hydroxyl radicals (OH.).
c) ROS are generated in different intracellular compartments, but notably in mitochondria.
d) ROS are functionally valuable: they play important roles in both intercellular and intracellular signalling.
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