Question

energy is released from atp when
a fourth phosphate is added to the molecule.
the last phosphate bond is broken.
all three phosphate bonds are formed.
the last phosphate bond is formed.

Explanation:

ATP (adenosine triphosphate) has three phosphate groups. Energy is released when the high - energy bond between the second and third (the last) phosphate groups is broken, converting ATP to ADP (adenosine diphosphate). Adding a phosphate (like adding a fourth or forming phosphate bonds) is part of energy - storing processes (like in phosphorylation), not energy - releasing from ATP. So the correct option is the one where the last phosphate bond is broken.

Answer:

B. the last phosphate bond is broken. (Here we assume the second option is labeled as B. If the original options had different labels, adjust the label accordingly based on the actual numbering, but the text of the option should be "the last phosphate bond is broken".)