Final answer:
True, a precursor tRNA molecule is cleaved by exonucleases to produce a mature tRNA molecule as part of its processing after transcription.
Step-by-step explanation:
True, a precursor tRNA molecule must be cut with exonucleases to produce a mature tRNA molecule. After transcription, in both eukaryotes and prokaryotes, tRNAs and rRNAs are transcribed as long precursor molecules. These precursors are then cleaved into functional subunits by various enzymes. For tRNA in particular, this process includes the cutting of precursor tRNA molecules to form mature tRNA, which is essential for the molecule to properly function in protein synthesis. This cleaving is done enzymatically, with exonucleases being one of the classes of enzymes that participate in processing the precursor tRNA.