| RNA processing | <molecular biology> Modifications of primary RNA trancripts including splicing, cleavage, base modification, capping and the addition of poly A tails. See: RNA editing. (23 Aug 1998) |
|---|---|
| RNA processing, post-transcriptional | Post-transcriptional biological modification of messenger, transfer, or ribosomal rnas or their precursors. It includes cleavage, methylation, thiolation, isopentenylation, pseudouridine formation, conformational changes, and association with ribosomal protein. (12 Dec 1998) |
| RNA, protozoan | Ribonucleic acid in protozoa having regulatory and catalytic roles as well as involvement in protein synthesis. (12 Dec 1998) |
| RNA replicase | <enzyme> An enzyme that catalyses RNA-template-directed extension of the 3'- end of an RNA strand by one nucleotide at a time, and can initiate a chain de novo. (enzyme nomenclature, 1992, p293) Chemical name: Nucleoside-triphosphate:RNA nucleotidyltransferase (RNA-directed) Registry number: EC 2.7.7.48 (12 Dec 1998) |
| RNA, ribosomal | A component of ribosomes, ribosomal RNA functions as a non-specific site for making polypeptides. Ribosomal RNA is abbreviated rrna. (12 Dec 1998) |
| RNA, ribosomal, 16s | Constituent of 30s subunit prokaryotic ribosomes containing 1600 nucleotides and 21 proteins. 16s rrna is involved in initiation of polypeptide synthesis. (12 Dec 1998) |
| RNA, ribosomal, 18s | Constituent of the 40s subunit of eukaryotic ribosomes. 18s rrna is involved in the initiation of polypeptide synthesis in eukaryotes. (12 Dec 1998) |
| RNA, ribosomal, 23s | Constituent of 50s subunit of prokaryotic ribosomes containing about 3200 nucleotides. 23s rrna is involved in the initiation of polypeptide synthesis. (12 Dec 1998) |
| RNA, ribosomal, 28s | Constituent of the 60s subunit of eukaryotic ribosomes. 28s rrna is involved in the initiation of polypeptide synthesis in eukaryotes. (12 Dec 1998) |
| RNA, ribosomal, 5.8s | Constituent of the 60s subunit of eukaryotic ribosomes. 5.8s rrna is involved in the initiation of polypeptide synthesis in eukaryotes. (12 Dec 1998) |
| RNA, ribosomal, 5s | Constituent of the 50s subunit of prokaryotic ribosomes containing about 120 nucleotides and 34 proteins. It is also a constituent of the 60s subunit of eukaryotic ribosomes. 5s rrna is involved in initiation of polypeptide synthesis. (12 Dec 1998) |
| RNA, satellite | Small, linear single-stranded RNA molecules functionally acting as molecular parasites of certain RNA plant viruses. Satellite rnas exhibit four characteristic traits: 1) they require helper viruses to replicate; 2) they are unnecessary for the replication of helper viruses; 3) they are encapsidated in the coat protein of the helper virus; 4) they have no extensive sequence homology to the helper virus. Thus they differ from satellite viruses which encode their own coat protein, and from the genomic RNA (=RNA, viral) of satellite viruses. (12 Dec 1998) |
| RNA splicing | <molecular biology> The removal of introns from primary RNA transcripts. (23 Aug 1998) |
| RNA splicing pattern | <molecular biology> The combination of DNA sequences copied from a gene by messenger RNA. The mRNAs transcribed from a single gene may splice together different parts of the sequence of the gene. (23 Aug 1998) |
| RNA, transfer | In cooperation with the ribosomes, transfer RNA brings (transfers) activated amino acids into position along the messenger RNA template. The abbreviation for transfer RNA is trna. (12 Dec 1998) |