Biochemistry General f2c0aeb5 Which of the following is true about capping of RNA following its synthesis A Occurs at 3' end of RNA B Occurs in nucleus of cell C Specific to MRNA of Prokaryotes D S-adenosyl methionine (SAM) acts as methyl donor High-Yield Explanation 7 - Methylguanosine attached to 5' end of RNA is called capping of RNA. Refer byte "Post transcriptional modification".