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Chapter 25: Problem 39

Draw structures of the nucleotides containing the following components: (a) deoxyribose and cytosine, (b) ribose and uracil.

Short Answer

Expert verified
a) Nucleotide with deoxyribose and cytosine: Deoxyribose is attached to the cytosine base via a N-glycosidic bond. A phosphate group may be added at the 5' carbon of deoxyribose. b) Nucleotide with ribose and uracil: Ribose is linked to uracil via a N-glycosidic bond. A phosphate group can be added at the 5' carbon of ribose.

Step by step solution

01

Figure out the structures of individual components

The first step is understanding the basic structure of the components involved. Deoxyribose and ribose are pentose (5-carbon) sugars with slightly different structures. Cytosine and uracil are nitrogenous bases. Cytosine is a pyrimidine base and has a single ring structure, whereas uracil, also a pyrimidine, is structurally similar to cytosine but lacks an amine group on carbon 4.
02

Draw the structures of individual components

In the next step, draw the structure of each component separately. For deoxyribose, indicate that it is a five carbon sugar (pentose) and the carbon atoms are numbered 1' to 5'. Similarly, draw the structures for cytosine and uracil.
03

Combine the components to form nucleotides

The final step is forming the nucleotides. In case (a), the deoxyribose sugar is linked to the cytosine base via a N-glycosidic bond between the 1' carbon of the sugar and the N1 atom of the base. A phosphate group could be added at the 5' carbon of the sugar to make it a nucleotide. In case (b), ribose sugar is coupled to the uracil base via a N-glycosidic bond between the 1' carbon of the sugar and the N1 atom of uracil. Similarly, a phosphate group may be added at the 5' carbon of the sugar.

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