Final answer:
Sequences on an mRNA important for ribosome association are typically part of the ribosome binding site, such as the Shine-Dalgarno sequence in prokaryotes, which interacts with the small ribosomal subunit to initiate translation.
Step-by-step explanation:
The mRNA sequences that are important for the proper association of the mRNA with a ribosome are likely to be part of the ribosome binding site, which includes specific sequences that interact with the ribosomal subunits. In prokaryotes like E. coli, this includes the Shine-Dalgarno sequence (AGGAGG), which is located upstream of the start codon (AUG) and plays a crucial role in the initiation of translation by binding to the complementary sequence on the small ribosomal subunit (16S rRNA). This sequence helps to anchor the ribosome to the mRNA and positions the start codon in the P-site of the ribosome to begin protein synthesis. Guanosine triphosphate (GTP) is also involved in this process as an energy source.