Yes, you are correct! In biological systems, the addition of a phosphate group to a molecule is a key mechanism for converting it into a higher-energy form.
For example, adenosine triphosphate (ATP) is a primary energy carrier in cells. ATP consists of adenine, ribose (a sugar), and three phosphate groups. The energy stored in the high-energy bonds between the phosphate groups can be released when these bonds are broken through hydrolysis, providing energy for various cellular processes.
So to summarize, the addition of a phosphate group to certain molecules can indeed increase their energy potential, allowing them to function effectively as energy carriers in cells.
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