Final answer:
The coordinate of the 3' end of the tra-RA transcript refers to its location on the RNA strand, where modifications like the formation of hairpin loop structures and the addition of C-C-A base triplet take place.
Step-by-step explanation:
The student is asking about the coordinate of the 3' end of the tra-RA transcript according to the "FlyBase Gene" track. The question pertains to the field of molecular biology, where transcripts represent the RNA copies made from DNA sequences in the process of gene expression. Identifying the 3' end of a transcript like tra-RA is essential for understanding the molecule's orientation and for subsequent cellular processes such as translation in protein synthesis.
Considering the context provided, particularly the information about the internal secondary structure at the 3' end and the enzymatic additions made post-transcription, the coordinate of the 3' end of the tra-RA transcript would be the position at which these modifications occur. This encompasses the location where the secondary hairpin loop structure forms that acts as a termination signal during transcription and where the tRNA nucleotidyl transferase adds the C-C-A base triplet sequence at the 3' end of the tRNA.
These details are important in understanding several molecular processes including transcription termination and the role of 3' untranslated regions (UTRs) in RNA stability and gene regulation.