Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Transcribed Image Text:**Question:**
What is the sugar that is shown in panel D in the last question?
**Options:**
- ○ L-Gulose
- ○ L-Altrose
- ○ D-Glucose
- ○ D-Talose
- ○ L-mannose
(Note: There are no graphs or diagrams present in the image that require explanation.)
Transcribed Image Text:### Understanding the Structure of Gulose
#### Open Chain Form of Gulose
The image illustrates Gulose in its open chain form, which is depicted as follows:
- **CHO** at the top.
- The carbon atoms are connected vertically with alternating groups:
- **C** connected to an **H** and **OH**.
- **C** connected to an **H** and **OH**.
- **C** connected to an **HO** and **H**.
- **C** connected to an **H** and **OH**.
- At the bottom, connected to the last carbon is **CH2OH**.
#### Identifying β-D-Gulose
The question posed is: “Which of the following shows β-D-Gulose?”
There are five cyclic structures labeled from A to E:
- **A)** A six-membered ring with OH groups in varying positions.
- **B)** A six-membered ring similar to A, with different OH and H orientations.
- **C)** Another six-membered ring; features differ in the spatial arrangement of OH and H groups.
- **D)** Another structural variant with a distinct orientation of OH and H groups.
- **E)** Features a different configuration of OH and H groups from the other options.
Each structure includes:
- A ring structure symbolizing the cyclic form.
- Functional groups attached at different points indicating specific stereochemistry.
The task is to match these structures to the β-anomeric form of D-Gulose by examining the orientation of the hydroxyl groups in each cyclic structure.
Expert Solution
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Carbohydrates are polyhydroxy aldehydes or ketones which are associated with reducing property and each carbohydrate is composed of carbon, hydrogen, and oxygen which are arranged in the empirical formula CnH2nOn.
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