• A pentose active in biological systems usually in its D-form.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2021
• A pentose which is an epimer at C-3 (in Fisher projection) of xylose. Structurally, it is a xylose with the OH and H groups interchanged at carbon-3.
  CRCH Nutrition Terminology
  Cancer Research Center of Hawaii, University of Hawaii, 2021
• Aldopentose found in riboflavin and ribonucleic acid (RNA) as well as in free ribonucleosides and ribonucleotides.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Ribose, five-carbon sugar found in RNA (ribonucleic acid), where it alternates with phosphate groups to form the "backbone" of the RNA polymer and binds to nitrogenous bases. Ribose phosphates are components of the nucleotide coenzymes and are utilized by microorganisms in the synthesis of the a...
  Encyclopedia Britannica
  Encyclopedia Britannica, Inc., 2020