In: Biology
Answer: Converge only when mRNA is to be translated
Reason:
Ribosomes considered as molecular machines and they synthesized from nuclear DNA to become smaller subunits and larger subunits in the cytoplasm. These subunits often converge each other to make mRNA translated for amino acid synthesis. Protein synthesis occurs in three steps namely, initiation, elongation and termination. During initiation, the mRNA, tRNA comes together at the ribosome and the translation initiates at the start codon (AUG, codes for methionine).