Chapter 18, Problem 18.139EP

(a)

Interpretation Introduction

Interpretation: Whether one or more galactose monosaccharide unit is/are present in sucrose has to be predicted.

Concept introduction: Sucrose is a disaccharide and it contains two monosaccharide units, Fructose and Glucose.  These monosaccharide units are joined together by $\alpha ,\beta \left(1\to 2\right)$ glycosidic linkage.

(b)

Interpretation Introduction

Interpretation: Whether one or more galactose monosaccharide unit is/are present in ribose has to be predicted.

Concept introduction: Monosaccharides are those types of sugars which cannot be further hydrolyzed.  Ribose is a pentose.

(c)

Interpretation Introduction

Interpretation: Whether one or more galactose monosaccharide unit is/are present in stachyose has to be predicted.

Concept introduction: Monosaccharides are those types of sugars which cannot be further hydrolyzed.  If two monosaccharides combine, then the sugar is called disaccharide.  If three monosaccharides combine, then the sugar is called trisaccharide.  Stachyose is a tetrasaccharide.

(d)

Interpretation Introduction

Interpretation: Whether one or more galactose monosaccharide unit is/are present in lactose has to be predicted.

Concept introduction: Lactose is a disaccharide and it contains two monosaccharide units, D-galactose and D-glucose which are joined together by $\beta \left(1\to 4\right)$ glycosidic linkage.