Podcast
Questions and Answers
What determines whether a sugar is in the D or L form?
What determines whether a sugar is in the D or L form?
- Optical rotation
- Position of the carbonyl group
- Position of the -OH group on the last chiral carbon (correct)
- Number of carbon atoms
Which form of sugar has the -OH group on the right side?
Which form of sugar has the -OH group on the right side?
- R form
- D form (correct)
- M form
- L form
Which sugar is also known as dextrose?
Which sugar is also known as dextrose?
- Glucose (correct)
- Galactose
- Maltose
- Fructose
Match the following terms with their corresponding descriptions:
Match the following terms with their corresponding descriptions:
Match the following configurations with their corresponding characteristics:
Match the following configurations with their corresponding characteristics:
Match the following terms with their meanings:
Match the following terms with their meanings:
Flashcards
D or L form of a sugar
D or L form of a sugar
Determined by the position of the -OH group on the last chiral carbon in the sugar molecule.
D form of sugar
D form of sugar
The form of a sugar in which the -OH group is on the right side of the last chiral carbon.
Glucose
Glucose
Also known as dextrose, it is a simple sugar with the molecular formula C6H12O6 and is a key energy source for living organisms.
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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