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Questions and Answers
What determines whether a sugar is in the D or L form?
Which form of sugar has the -OH group on the right side?
Which sugar is also known as dextrose?
Match the following terms with their corresponding descriptions:
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Match the following configurations with their corresponding characteristics:
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Match the following terms with their meanings:
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Study Notes
Stereoisomers of Sugars
- The 'handedness' of a sugar molecule, whether it is a D-sugar or an L-sugar, is determined by the spatial arrangement of atoms around an asymmetric carbon atom.
- A sugar is classified as D if the -OH group on the asymmetric carbon atom farthest from the aldehyde or ketone group is on the right side, and L if it is on the left side.
Identity of Sugars
- D-Glucose, also known as dextrose, is a common sugar found naturally in many foods.
- D-sugars are more common in nature than L-sugars.
Configuration and Characteristics
- The Fischer projection is a way to represent the three-dimensional structure of a sugar molecule in two dimensions.
- Sugars can exist as anomers, which are isomers that differ in the configuration of the hydroxyl group on the anomeric carbon atom.
Key Terms and Definitions
- Anomer: a type of isomer that differs in the configuration of the hydroxyl group on the anomeric carbon atom.
- Asymmetric carbon atom: a carbon atom that has four different groups attached to it, resulting in a non-superimposable mirror image.
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Description
Test your knowledge on the D and L configuration of sugars, and how it is determined based on the orientation of the -OH group on the last chiral carbon. Explore the relationship between glucose, glyceraldehyde, and the rotation of plane polarised light.
