During RNA processing a(n) a long string of adenine nucleotides is added to the 3' end of the RNA.
The term "RNA processing" refers to the sequence of events that occurs during the maturation of a gene's primary transcript. Transcripts from nuclear protein-coding genes acquire a 5′ cap structure very quickly after RNA polymerase II begins synthesis.
In eukaryotic cells, RNA synthesis occurs in the nucleus and is distinct from protein synthesis, which occurs in the cytoplasm. In protein synthesis, three types of RNA are involved. They are ribosomal RNA (rRNA), messenger RNA (mRNA), and transfer RNA (tRNA). Ribosomes are required for protein synthesis and are formed by rRNA. A ribosome is made up of both large and small ribosomal subunits. RNA polymerase is a multi-unit enzyme that uses transcription to create RNA molecules from a DNA template.
To learn more about RNA processing, here
https://brainly.com/question/5642073
#SPJ4