Biochemistry

Ribose is found in ribonucleic acids ,free nucleotides , and some coenzymes . Phosphoric esters of ribose are formed in the body during the oxidation of glucose in the pentose phosphate cycle. When ribose is restored , the pyatatomic alcohol ribitol is released , which is part of some vitamins (for example, vitamin B 2 and coenzymes (FAD). D-Ribose HC-OH I HC-OH I HC-OH I CH 2 OH Ribitol D- deoxyribose is a carbohydrate component of DNA and nucleotides. It can be in acyclic and cyclic forms. H H H I I I HOH,C-C — C -c 'III H OH H (acyclic form) (cyclic form) D- deoxyribose The general formula of hexoses is C^N^Cf. They are found in a free state and in oligo- and polysaccharides. These include glucose, fructose, mannose, galactose . a- D- glucose (dextrose, grape sugar) is found in acyclic and cyclic forms. 142