The ribonucleosides that make up ribonucleic acid (RNA) are composed of d-ribose (a
Chapter 16, Problem 16-43(choose chapter or problem)
The ribonucleosides that make up ribonucleic acid (RNA) are composed of d-ribose (a sugar) and four heterocyclic bases. The general structure of a ribonucleoside is shown here. The four heterocyclic bases are cytosine, uracil, guanine, and adenine. Cytosine and uracil are called pyrimidine bases because their structures resemble pyrimidine. Guanine and adenine are called purine bases because their structures resemble purine.
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