Final answer:
The statement that the mRNA transcript encounters ribosomal parts immediately as it leaves the DNA in prokaryotes is true. The lack of a nucleus in prokaryotes allows transcription and translation to occur simultaneously, enabling a fast response to environmental changes.
Step-by-step explanation:
In prokaryotes, it is indeed true that the mRNA transcript encounters ribosomal parts immediately as it emerges from the DNA. This is because prokaryotic cells do not have a membrane-bound nucleus and therefore, transcription and translation occur concurrently in the cytoplasm. This allows a prokaryotic cell to rapidly respond to environmental cues by initiating the protein synthesis process even before the mRNA transcript is fully completed. On the contrary, in eukaryotic cells, the presence of a nucleus means that mRNA must be fully transcribed, processed, and transported out of the nucleus before it can be translated by ribosomes in the cytoplasm, thus these processes cannot occur simultaneously.