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

1. Introduction to Biochemistry

Carbohydrates

Biochemistry

1. Introduction to Biochemistry

Carbohydrates

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Multiple Choice

Which of the following best describes a key structural difference between starch and cellulose?

Starch is composed of fructose units, while cellulose is composed of glucose units.

Starch is found only in animals, while cellulose is found only in plants.

Starch is a linear polymer, while cellulose is highly branched.

Starch contains α(1→4) glycosidic bonds, while cellulose contains β(1→4) glycosidic bonds.

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Verified step by step guidance

Understand the structural composition of starch and cellulose: Both starch and cellulose are polysaccharides composed of glucose units, but their structural differences arise from the type of glycosidic bonds connecting these glucose units.

Learn about glycosidic bonds: Glycosidic bonds are covalent bonds that link monosaccharides together. In starch, the glucose units are connected by α(1→4) glycosidic bonds, while in cellulose, the glucose units are connected by β(1→4) glycosidic bonds.

Visualize the difference between α and β glycosidic bonds: α(1→4) bonds result in a helical structure, which is characteristic of starch, whereas β(1→4) bonds result in a straight, rigid structure, which is characteristic of cellulose.

Relate the structural differences to biological function: Starch's helical structure makes it suitable for energy storage in plants, while cellulose's rigid structure provides structural support in plant cell walls.

Conclude the key structural difference: The correct answer is that starch contains α(1→4) glycosidic bonds, while cellulose contains β(1→4) glycosidic bonds, which is the defining feature that distinguishes these two polysaccharides.