<prompt> 7-Methyl guanosine cap is present in:mRNAtRNArRNADNA  <response>: Ref: Harpers Illustrated Biochemistry. 28th ed, ch. 36,pp-349Explanation:The 52 cap is found on the 52 end of an mRNA molecule and consists of a guanine nucleotide connected to the mRNA via an unusual 52 to 52 triphosphate linkage. This guanosine is methylated on the 7position directly after capping in vivo by a methyl transferase. It is referred to as a 7-methylgu- anylate cap, abbreviated m G.Capping - 5 endAddition of modified nucleotide7-methylguanosine to 5 endGuanvl transferase methyl transferase.FunctionsmRNA recognitionPromotion of 52 proximal intron excision.Prevention of degradation by exonucleases.Regulation of Nuclear TransportExportPromotion of translation Stability 