RNA

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Related to Positive-sense RNA: negative strand virus

RNA

 
messenger RNA (mRNA) see ribonucleic acid.
ribosomal RNA (rRNA) see ribonucleic acid.
transfer RNA (tRNA) see ribonucleic acid.

RNA

Abbreviation for ribonucleic acid; Registered Nurse Anesthetist. For terms bearing this abbreviation, see subentries under ribonucleic acid

RNA

(är′ĕn-ā′)
n.
A nucleic acid present in all living cells and many viruses, consisting of a long, usually single-stranded chain of alternating phosphate and ribose units, with one of the bases adenine, guanine, cytosine, or uracil bonded to each ribose molecule. RNA molecules are involved in protein synthesis and sometimes in the transmission of genetic information. Also called ribonucleic acid.

RNA

 Ribonucleic acid Molecular biology A polymer of ribonucleic acids that functions in coding, storage, transfer and translation of genetic information. See Antisense RNA, Catalytic RNA, Chromosomal RNA, Heterogenous nuclear RNA, Pre-mRNA, Ribosomal RNA, Transfer RNA.

RNA

Abbreviation for ribonucleic acid.

RNA

Abbrev. for ribonucleic acid. This molecule, in common with DNA and MITOCHONDRIAL DNA, carries coded instructions for the synthesis of specific proteins from AMINO ACIDS. RNA may be a double chain like DNA but in the cell usually exists as a single polynucleotide chain, like one strand of the double helix of DNA. Whereas in most cells DNA carries the permanent, inheritable code for cell reproduction, RNA most commonly acts as a transcriber or as MESSENGER RNA (mRNA) carrying the code elsewhere, as to the RIBOSOMES in cells where proteins are actually formed. In some viruses, however, the inherited code for replication occurs in the form of RNA. Transfer RNA (tRNA) picks up and carries amino acids to the ribosomes to be inserted in the correct sequence of the protein. Ribosomes contain ribosomal RNA (rRNA) and proteins.RNA can take up complex three-dimensional configurations an can act as an enzyme with itself as substrate. It seems likely that RNA preceded DNA in evolution.

RNA (ribonucleic acid)

a NUCLEIC ACID generally composed of a single POLYNUCLEOTIDE CHAIN of RIBONUCLEOTIDES,which is found in cells of both prokaryotes and eukaryotes. RNA is a vital component of PROTEIN SYNTHESIS, and occurs in three main forms:
  1. (a) MESSENGER RNA produced in TRANSCRIPTION and involved in transferring genetic information from DNA to RIBOSOMES;
  2. (b) RIBOSOMAL RNA forming a major structural component of the ribosomes;
  3. (c) TRANSFER RNA which acts as an ‘adaptor’ molecule and carries amino acids to the ribosomes to be inserted in the correct sequence during translation. RNA is also found in some viruses as the primary genetic material. Other types of RNA have regulatory roles; see, for example, ANTISENSE RNA; or processing roles, for example snRNA.

RNA

Abbreviation for ribonucleic acid.
References in periodicals archive ?
The family Picornaviridae is highly diverse and contains small, nonenveloped viruses with a single-stranded positive-sense RNA genome that encodes a single polyprotein; it consists of 12 genera and 2 possibly new genera (7), a subset of which can infect and cause disease in humans.
The viral capsid encloses a single-stranded, positive-sense RNA genome of 7.3-7.7 kb that is organized in 3 open reading frames (ORFs), of which ORF1 encodes a polyprotein that is proteolytically cleaved into 6 nonstructural proteins, including RNA-dependent RNA polymerase (RdRp), helicase, and protease (1).
As a member of the family Caliciviridae, SaV has a single-stranded positive-sense RNA genome of [approximately equal to] 7.3-7.5 kb that contains either 2 or 3 main open reading frames (ORFs 1-3).
To the Editor: The picornaviruses constitute a large, diverse family of positive-sense RNA viruses, which comprise 8 genera: Enterovirus, Aphthovirus, Cardiovirus, Hepatovirus, Parechovirus, Erbovirus, Kobuvirus, and Teschovirus (1).
They are single-stranded positive-sense RNA viruses with a characteristic 5- or 6-pointed star, which has an electrondense center when viewed by negative-stain electron microscopy.
The norovirus genome consists of a single strand of positive-sense RNA organized into 3 open reading frames (ORFs).
The DENV genome is a single-stranded positive-sense RNA of [approximately equal to] 11,000 nucleotides (nt) that encodes 3 structural proteins (capsid, membrane, and envelope) and 7 nonstructural proteins (NS1, NS2A, NS2B, NS3, NS4A, NS4B, and NS5) (3).

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