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Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079

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Chapter
Section
BuyFindarrow_forward

Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079
Textbook Problem

Which of the following statements about the polysaccharide hyaluronic acid is incorrect?

  1. a. The repeating unit present is a disaccharide.
  2. b. Two different types of glycosidic linkages are present.
  3. c. All monosaccharide units present are glucosamine derivatives.
  4. d. no correct response

Interpretation Introduction

Interpretation: The incorrect statement about the polysaccharide hyaluronic acid has to be identified.

Concept introduction: The polysaccharides which contain disaccharides as the repeating units in which one of the disaccharide unit is an amino sugar and one or both the disaccharide units possess negative charge due to the presence of sulfate or carboxyl groups are known as acidic polysaccharides.

Explanation

Reason for correct option:

An example of acidic polysaccharide is hyaluronic acid.  It contains disaccharide units of N-acetyl-β-D-glucosamine and D-glucuronate.  The repeating units of hyaluronic acid are shown below.

The loss of an acidic hydrogen atom from D-glucuronic acid results in the formation of D-Glucuronate

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