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Chapter 28: Question 28.35 (page 1141)

Draw the structures of the nucleosides formed from each of the following components: (a) ribose + uracil; (b) 2-deoxyribose + guanine.

Short Answer

Expert verified

Answer

(a.)Ribose+uracil

2-deoxyribose+guanine(b.)

Step by step solution

01

Ribose and deoxyribose

Ribonucleotides are the building blocks of the polymer ribonucleic acid, or RNA, the messenger molecules that convert genetic information into proteins.

Deoxyribonucleotides are the building blocks of the polymer deoxyribonucleic acid, or DNA, the molecules responsible for storing all genetic information.

02

N-glycosides

Each nucleoside has sugar and a base, joined together by a 尾-N-glycosidic linkage.

The structure of uracil is:

Structure of uracil

The structure of guanine is:

Structure of guanine

03

Given Nucleosides structure

Ribose is a pyranose ring. Uracil is a nucleobase that helps with cell functioning.

The structures of the required N-glycosides are as shown:

Nucleoside formed from ribose+uracil

Nucleoside formed from 2-deoxyribose+guanine

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Most popular questions from this chapter

Consider the tetrasaccharide stachyose drawn below. Stachyose is found in white jasmine, soybeans, and lentils. Because humans cannot digest it, its consumption causes flatulence.

a. Label all glycoside bonds.

c. What products are formed when stachyose is hydrolyzed with H3O+?

d. Is stachyose a reducing sugar?

e. What product is formed when stachyose is treated with excess CH3I, Ag2O?

f. What products are formed when the product in (e) is treated with H3O+?

(a) Convert each cyclic monosaccharide into a Fischer projection of its acyclic form. (b) Name each monosaccharide. (c) Label the anomer as 伪 or 尾.

Classify each compound as a reducing or nonreducing sugar.

(a.)

(b.)

(c.)

(a)Label all the O atoms that are part of a glycoside in rebaudioside A. Rebaudioside A, marketed under the trade name Truvia, is a sweet glycoside obtained from the stevia plant, which has been used for centuries in Paraguay to sweeten foods. (b)The alcohol or phenol formed from the hydrolysis of glycoside is called an aglycon. What aglycon and monosaccharides are formed by the hydrolysis of rebaudioside A?

Classify each compound as identical to A or its enantiomer.

(a.)

(b.)

(c.)
See all solutions

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