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Chapter 13: Q. 13.65 (page 467)

What are the differences in the Fischer projections of D-fructose and D-galactose? (13.3)

Short Answer

Expert verified
D-Glucose and D-fructose are isomers of commonly consumed monosaccharides. The ratio of conversion of D-glucose to D-fructose by glucose isomerase (xylose isomerase) is not more than 50 %.

Step by step solution

01

introduction

  • Although a variety of monosaccharides are found in living organisms, three hexoses are particularly abundant: D-glucose, D-galactose, and D-fructose
  • Glucose and galactose are both aldohexoses, while fructose is a ketohexose.
02

 Differences in the Fischer projections of D-fructose and D-galactose

  • D-Fructose is a ketohexose, whereas D-galactose is an aldohexose.
  • In galactose, the - OHon carbon 4 is on the left; in fructose, the -OHis on the right.

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Most popular questions from this chapter

Identify each of the following as the D or L enantiomer:

What are the differences in the Haworth structures of 伪-D-glucose and 尾-D-glucose? (13.4)

What functional groups are found in all monosaccharides?

Draw the Fischer projection for the other enantiomer of a to d in problem 13.22.

Draw the Fischer Projection for each of the following wedge-dash structures:
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