13. What monomer is represented by this diagram?
nitrogen base
phosphate
5-carbon sugar

diabetes One two three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and five of the one two three four five and four five and three four five four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and four five and three four five and five of the one two three four five and four five and three four five and four five and three four five and four five and three four five and five of the one two three four five and four five and three four five = $/83822!2