What is one function of nucleotides besides being building blocks of nucleic acids?

Nucleotides, in addition to serving as the fundamental building blocks of nucleic acids like DNA and RNA, have several other important functions, one of which is acting as energy carriers and signaling molecules. Adenosine triphosphate (ATP), for instance, is a nucleotide that plays a critical role in energy transfer within cells. It provides the energy required for many biochemical reactions by releasing phosphate groups, which can be used to power processes such as muscle contraction and various metabolic pathways.

Furthermore, nucleotides can function as signaling molecules. Cyclic adenosine monophosphate (cAMP) is a nucleotide that serves as a secondary messenger in cellular signaling pathways, facilitating communication within and between cells. This dual role in energy transfer and signaling is vital for the regulation of numerous physiological processes.

In contrast, the other options either misconstrue the role of nucleotides or overly limit their functions. Nucleotides do not serve solely as structural support, nor are they primarily used for storage; rather, this is a characteristic associated with other macromolecules, like carbohydrates and lipids. Finally, while nucleotides can be involved in transport at a molecular level, stating that they are involved only in cellular transport overlooks their broader significance