
Concept explainers
(a)
Interpretation : To classify the given saccharide as mono, di, tri or polysaccharide.
Concept Introduction : Carbohydrates are composed of certain monomer units called as monosaccharides. Monosaccharides are polyhydroxy
(a)

Answer to Problem 75UTC
Melezitose is a tri-saccharide as it is composed of three monosaccharide units.
Explanation of Solution
Given:
In the given structure of molecule there are three sugar molecules bonded with each other. Hence there are three monosaccharide units bonded to each other by two glycosidic linkages that make it a tri-saccharide molecule.
(b)
Interpretation : To identify the keto and aldohexose present in melezitose.
Concept Introduction : Carbohydrates are composed of certain monomer units called as monosaccharides. Monosaccharides are polyhydroxy aldehyde and ketones which are bonded with each other to form polysaccharides.
(b)

Answer to Problem 75UTC
Melezitose is composed of two aldohexose (glucose) and one ketohexose (fructose) units.
Explanation of Solution
In the given structure of molecule there are three sugar molecules; out of which two are pyranose rings with total 6 C atoms hence they should be aldohexose monosaccharides whereas one is furanose ring bonded with two −CH2OH groups at both terminals that proves it as a ketohexose. Hence Melezitose is composed of two aldohexose and one ketohexose units.
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Chapter 18 Solutions
Basic Chemistry Plus Mastering Chemistry With Pearson Etext -- Access Card Package (6th Edition)
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