Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

9. Carbohydrates

Monosaccharide Configurations

Biochemistry

9. Carbohydrates

Monosaccharide Configurations

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Multiple Choice

How many D-stereoisomers are possible for a D-ketopentose?

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Understand that a D-ketopentose is a five-carbon sugar with a ketone group. The 'D' designation refers to the configuration of the chiral center farthest from the carbonyl group, which is similar to D-glyceraldehyde.

Identify the number of chiral centers in a ketopentose. A ketopentose has three chiral centers because the ketone group is typically at the second carbon, leaving three other carbons that can be chiral.

Use the formula for calculating the number of stereoisomers: \(2^n\), where \(n\) is the number of chiral centers. For a ketopentose, \(n = 3\).

Calculate \(2^3\) to determine the total number of stereoisomers possible for a ketopentose.

Since the problem specifies D-stereoisomers, consider only those configurations that are D, which is half of the total stereoisomers. Therefore, divide the total number of stereoisomers by 2 to find the number of D-stereoisomers.