RNA(redirected from Positive-sense RNA)
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Related to Positive-sense RNA: negative strand virus
messenger RNA (mRNA) see ribonucleic acid.
ribosomal RNA (rRNA) see ribonucleic acid.
transfer RNA (tRNA) see ribonucleic acid.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Abbreviation for ribonucleic acid; Registered Nurse Anesthetist. For terms bearing this abbreviation, see subentries under ribonucleic acid
Farlex Partner Medical Dictionary © Farlex 2012
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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
RNARibonucleic 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.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
Abbreviation for ribonucleic acid.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
RNAAbbrev. 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.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
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:
- (a) MESSENGER RNA produced in TRANSCRIPTION and involved in transferring genetic information from DNA to RIBOSOMES;
- (b) RIBOSOMAL RNA forming a major structural component of the ribosomes;
- (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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
Abbreviation for ribonucleic acid.
Medical Dictionary for the Dental Professions © Farlex 2012