So ultimately, what happens is that energy that is produced in the nuclear reactions is basically stored in these chemical bonds within these sugar molecules. And when we ingest these sugar molecules, we essentially take that same energy that came from the sun and store it in the ATP molecules and use those ATP molecules to carry out all the different types of processes that take place inside our cells. So we see that the first role that sugars play is basically energy storage and fuel source. So we use these sugars to basically carry out different types of reactions by using these ATP molecules that ultimately came from the glycolysis process, the breakdown of glucose. Now, the second role that sugars play is actually being present in nucleic acids such as RNA and DNA molecule. In fact, ATP adenosine triphosphate itself contains a ribose sugar.