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

Reducing Sugars

Biochemistry

9. Carbohydrates

Reducing Sugars

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Multiple Choice

Which of the following statements about reducing sugars is true?

All disaccharides are reducing sugars.

Reducing sugars possess a free aldehyde or ketone group capable of acting as a reducing agent.

Sucrose is a typical example of a reducing sugar.

Reducing sugars cannot react with Benedict's reagent.

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Verified step by step guidance

Understand the concept of reducing sugars: Reducing sugars are carbohydrates that possess a free aldehyde (-CHO) or ketone (-C=O) group, which allows them to act as reducing agents in chemical reactions.

Analyze the statement 'All disaccharides are reducing sugars': This is incorrect because not all disaccharides have a free aldehyde or ketone group. For example, sucrose is a disaccharide but is not a reducing sugar because its glycosidic bond involves both anomeric carbons, preventing the formation of a free aldehyde or ketone group.

Evaluate the statement 'Reducing sugars possess a free aldehyde or ketone group capable of acting as a reducing agent': This is correct because the presence of a free aldehyde or ketone group allows the sugar to donate electrons in redox reactions, such as reacting with Benedict's reagent.

Examine the statement 'Sucrose is a typical example of a reducing sugar': This is incorrect because sucrose does not have a free aldehyde or ketone group due to its glycosidic bond structure, making it a non-reducing sugar.

Assess the statement 'Reducing sugars cannot react with Benedict's reagent': This is incorrect because reducing sugars can react with Benedict's reagent, resulting in the formation of a precipitate (typically red or orange) due to the reduction of copper(II) ions to copper(I) oxide.