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Chapter 13: Q. 13.74 (page 467)

Why are lactose and maltose reducing sugars, but sucrose is not? (13.6)

Short Answer

Expert verified
  • Lactose is a sugar present in milk and milk products such as cheese and ice cream.
  • Lactose malabsorption is the source of digestive discomfort in lactose intolerance.

Step by step solution

01

:Introduction

  • Lactose is a sugar present in milk and milk products such as cheese and ice cream.
  • Lactose malabsorption is the source of digestive discomfort in lactose intolerance.
  • Maltose, often known as malt, is a disaccharide that consists of two alpha D glucose units. An alpha 1,4 glycosidic bond connects the two units of glucose.
  • The enzymes maltase and isomaltase break down maltose molecules into two glucose molecules in the human small intestine mucosa, which are then absorbed by the body.
  • After cellulose, starch is the most abundant carbohydrate in plant cells.
02

Check whether lactose and maltose reducing sugars, but sucrose is not

  • Lactose and maltose have free -OHgroups on the glucose or fructose molecules that's why they are reducing sugar while sucrose has no free -OH groups

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Most popular questions from this chapter

Kate's blood volume is 3.9L. After three months of diet and exercise, if her blood glucose is 146mg/dL, how many grams of glucose are in her blood?

ldentify each of the following as the 伪or 尾isomer.

What is a monosaccharide? A disaccharide?

Draw the Fischer projection for the oxidation and the reduction products of D-ribose. What are the names of the sugar acid and the sugar alcohol produced?

Sophorose, a carbohydrate found in certain types of beans, has the following Haworth structure:

a. Is sophorose a mono-, di-, or polysaccharide?

b. What are the monosaccharides in sophorose?

c. What is the glycosidic link in sophorose?

d. Is this the 伪or 尾isomer of sophorose?

e. Is sophorose a reducing sugar?
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