Which statement best describes roles of nucleotide derivatives beyond DNA and RNA structure?

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Nucleotides do more than make up DNA and RNA; many derivatives have essential roles in energy management and cell signaling. ATP and GTP act as energy currencies, releasing phosphate groups to drive countless cellular processes. They also participate in signaling: GTP can power molecular switches (G proteins) that control pathways, and ATP serves as the phosphate donor in many signaling kinases that modify proteins. cAMP, produced from ATP, is a classic second messenger that relays hormonal signals to regulate metabolism and other cellular responses. The statement that brings together these varied roles—that ATP, GTP, and cAMP function as energy sources and signaling molecules—best captures how nucleotide derivatives operate beyond nucleic acid structure. The other ideas are too narrow: ATP isn’t only an energy source, GTP isn’t limited to protein synthesis, and cAMP clearly has signaling functions.