Vitamin E and Alzheimer's Risk. A second study in the July issue of the Archives of Neurology shows that eating foods rich in vitamin E may help lower risks of developing dementia and Alzheimer's disease.
Ribose and Deoxyribose. The 5-carbon sugars ribose and deoxyribose are important components of nucleotides, and are found in RNA and DNA, respectively. The sugars found in nucleic acids are pentose sugars; a pentose sugar has five carbon atoms. A combination of a base and a sugar is called a nucleoside. Ribose, found in RNA, is a normal sugar, with one oxygen atom attached to each carbon atom. Deoxyribose, found in DNA, is a modified sugar, lacking one oxygen atom (hence the name deoxy).
The carbohydrate in DNA is deoxyribose. More fully, the name is beta-D-2-deoxyribose. DNA is a polymer of nucleotides. Each nucleotide consists of a phosphate group, â¦ a molecule of deoxyribose, and one of four bases. Deoxyribose is a pentose sugar (it has five carbon atoms). In DNA the sugar residue includes a five-membered ring comprising four of the carbons and one oxygen atom.