Final answer:
The accurate statement regarding structural genes is that their transcription entails the use of additional DNA sequences beyond the gene itself. Structural genes can generate both proteins and RNA molecules, including tRNA.
Step-by-step explanation:
The correct statement about a structural gene is that transcription of structural genes requires DNA sequences that are not part of the gene itself. These necessary sequences include regions such as the promoter and terminator. Transcription involves initiation, where RNA polymerase binds to the promoter, elongation, where the RNA is synthesized, and termination, where the process ends at the terminator site. Additionally, structural genes can result in protein or RNA, including tRNA molecules, contrary to the suggestion that transcription of a structural gene can only lead to proteins.
It's important to note that the gene itself is not the only important region, as regulatory elements are vital for gene expression. Also, a structural gene may encode various RNA molecules, including mRNA, tRNA, and rRNA, depending on its function in the cell.