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Chapter 28: Question 28.64 (page 1150)

Draw the structure of a disaccharide formed from two mannose units joined by a 1-4鈫�伪glycosidic linkage.

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01

Disaccharide

Disaccharides constitute sugars generated when two monosaccharides are connected via a glycosidic linkage. Some examples of monosaccharides include maltose and lactose.

02

Glycosidic linkage

Glycosidic linkage or glycosidic bond constitutes a covalent bond that links a carbohydrate to another molecule. Molecules comprising a glycosidic bond are termed glycosides.

03

Structure of the disaccharide formed from two mannose units

The structure of a disaccharide generated by linking two mannose units is:

Disaccharides formed from two mannose units

The disaccharide is produced by alpha linkage as the -OH group is located below the ring. The formation of disaccharides also involves a condensation reaction. The water molecules are eliminated in the condensation reactions.

The structure of the mannose is:

Structure of mannose

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Most popular questions from this chapter

Drawthe products of each reaction.

(a.)

(b.)

(a) Why can鈥檛 two purine bases (A and G) form a base pair and hydrogen bond to each other on two strands of DNA in the double helix? (b) Why is hydrogen bonding between guanine and cytosine more favorable than hydrogen bonding between guanine and thymine?

a. Identify the glycosidic linkage in disaccharide C, classify the glycosidic bond as 伪or尾, and use numbers to designate its location.

b. Identify the lettered compounds in the following reaction.

Which aldoses are oxidized to optically inactive aldaric acids: (a) D-erythrose; (b) D-lyxose; (c) D-galactose?

(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?
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