What is the sugar–sugar linkage among the following in the 5’ cap on mRNA molecules?
In molecular biology, nucleic acid structure and recombination dictates that hairpin formation, Holliday junction resolution and translation control ensure fidelity. Therefore 5’-5’ is correct as it matches molecular mechanisms, supported by mechanistic studies and conserved across related systems.
Ref: Lodish et al., Molecular Cell Biology, 8th Edition, Chapter 8, RNA Processing and Translation, covers mRNA hairpins, puromycin mechanism and aminoacyl-tRNA function governing protein synthesis.
