Ribonucleic acid (abbreviated as RNA) exists in biological cells and some viruses. Genetic information carrier in viroid. RNA consists of ribose? Nucleotide classics? Phosphodiester bonds condense to form chain molecules.
One? Ribonucleotide molecules are composed of phosphoric acid, ribose and? Basic composition. RNA mainly has four bases, namely a? Adenine, g guanine, c cytosine, u? Uracil, in which u (uracil) replaces t in DNA.
Are you online? In eukaryotes, the precursor RNA formed by transcription contains a large number of non-coding sequences, of which only about 25% are processed into mRNA and finally translated into protein. Because this kind of unprocessed precursor mRNA(pre-mRNA) varies greatly in molecular size, it is usually called heteronuclear RNA (HNRNA).
Prokaryotic mRNA generally has an untranslated region at the 5' end, which is called the leader region, and an untranslated region at the 3' end with protein in the middle. Coding area, generally coding several protein.
Eukaryotic mRNA (in cytoplasm) generally consists of 5'- terminal hat structure, 5'- terminal untranslated region, translated region (coding region), 3'- terminal untranslated region and 3'- terminal polyadenylate tail.