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Chapter 8: Q12. (page 243)

Identify the monosaccharides and their linkages in the following disaccharide.

Short Answer

Expert verified

The monomers in the given disaccharide are galactose and fructose. It contains 尾 (1鈫�6) glycosidic linkage.

Step by step solution

01

Identifying monosaccharides and disaccharides

The given Haworth ring structure is galactose and fructose. The monosaccharides,galactose,andfructosearecombinedto form a disaccharide called lactulose. Lactulose is a synthetic sugar used as a prebiotic ingredient.

02

Linkage formation

Galactose is an aldose, while fructose is a ketose sugar. The carbon 1 of the monosaccharide 尾 -D-galactose is involved in the glycosidic linkage with the carbon 6 of 尾-D- fructose. Thus, 尾(1-6) glycosidic linkage is formed in lactulose.

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Most popular questions from this chapter

Are (a) D-glucitol, (b) D-galactitol, and (c) D-glycerol optically active?

Show how aldoses and ketoses can form five- and six-membered rings.

How many different disaccharides of D-glucopyranose are possible?

The core of pectin molecules is a polymer of 伪 (1鈫�4)-linked D-galacturonate. Draw one of its residues.

Question: A certain metabolic reaction takes the form A鈫�B. Its standard free energy change is 7.5kJ.mol-1. (a) Calculate the equilibrium constant for the reaction atdata-custom-editor="chemistry" 25掳C.(b) Calculate 鈭�Gat37掳Cwhen the concentration of Ais 0.5mMand the concentration of Bis 0.1mM. Is the reaction spontaneous under these conditions? (c) How might the reaction proceed in the cell?
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