I want to know the answer to the following question:
What is often said to be stored by cells in the structures of molecules of substances such as carbohydrates, lipids and proteins?
All the background I'm provided with is that "Energy is thus often said to be stored by cells in the structures of molecules of substances such as carbohydrates (including sugars), lipids, and proteins, which release energy when reacted with oxygen in respiration.". Is that enough to answer the question?