Energy in the body is stored as ATP until it is needed. When needed, it loses a high-energy phosphate bond to become adenosine diphosphate (ADP).

Question

BlackTom AI · Accepted Answer

The question presents two statements about energy storage and usage in the body, so I will evaluate each one.
Option A: 'The first statement is TRUE. The second statement is FALSE.' Here, the first part says energy is stored as ATP until needed, which is correct because ATP acts as the primary energy currency in cells, storing energy in its phosphate bonds. The second part claims that when energy is needed, ATP loses a high-energy phosphate bond to become ADP. This is also correct in general biology: ATP is hydrolyzed to ADP (and inorganic phosphate, Pi), releasing energy used for cellular work. Therefore, this option mislabels the second statement as false, making it incorrect.
Option B: 'The first statement is FALSE. The second statement is TRUE.' This option asserts the first statement is false, which contradicts the established role of ATP as the energy storage molecule. Because the first statement is true, this option is incorrect regardless of the second statement, which is true.
Option C: 'Both statements are TRUE.' This option claims both statements are true, which aligns with the standard understanding that ATP stores energy and that energy release involves conversion of ATP to ADP via loss of a high-energy phosphate bond. Since the first statement is true and the second statement is true, this option is consistent with foundational bioenergetics. However, you should ensure this option matches exactly what is being asked: if both are indeed true, this would be the correct choice.
Option D: 'Both statements are FALSE.' This would be the opposite of what is known about ATP physiology, making it clearly incorrect.
In summary, the first statement correctly identifies ATP as the energy-storing molecule, and the second correctly describes the ATP-to-ADP hydrolysis step that liberates energy for cellular processes. The option that reflects both statements as true corresponds to the accurate interpretation of these concepts.

Energy in the body is stored as ATP until it is needed. When needed, it loses a high-energy phosphate bond to become adenosine diphosphate (ADP).

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