To generate ADP from ATP, the bond that is typically broken is the one connecting the terminal phosphate group to the rest of the molecule. This is usually referred to as the high-energy phosphate bond.
If you have specific bond labels (1, 2, 3, 4) on your model, the correct response would be the bond that corresponds to the terminal phosphate group (often Bond 1, but it would depend on your specific model). If you can identify which of the bonds connects the terminal phosphate group, that is the bond that is broken to create ADP.
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