What is the primary function of ATP in cells?

ATP, or adenosine triphosphate, is often referred to as the energy currency of the cell because it plays a crucial role in storing and transferring energy within cells. When ATP is hydrolyzed, it releases energy that is utilized by various cellular processes, including muscle contraction, active transport across membranes, and biochemical reactions necessary for life. This process allows cells to perform work and maintain homeostasis, making ATP indispensable for cellular functions.

The option that mentions storing genetic information pertains to the role of nucleic acids, like DNA and RNA, which are pivotal for encoding and transmitting genetic material. The choice that refers to building blocks for proteins aligns with the function of amino acids, which assemble into polypeptides and are essential to protein synthesis. Lastly, while nutrient transport is important for cellular function, it is not primarily associated with ATP's main role, which centers on energy transfer rather than nutrient movement. Hence, the correct answer accurately captures ATP's primary role in cellular metabolism and function.