Give scientific reasons: Transcription and translation could be coupled in prokaryotic cell but not in eukaryotic cell.

(N/A) In prokaryotes,the $mRNA$ synthesized does not require any processing to become active,and both transcription and translation occur in the same cytosol. In contrast,in eukaryotes,the primary transcript contains both exons and introns and is subjected to a process called splicing,where introns are removed and exons are joined in a definite order to form mature $mRNA$. Furthermore,in eukaryotes,transcription occurs in the nucleus,while translation occurs in the cytoplasm,creating a physical separation between the two processes.