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

The structure of a disaccharide is shown below. Which statement applies?A) The two monosaccharide units are joined by a glycosidic bond.B) The disaccharide contains a peptide bond between its units.C) The two monosaccharides are linked by a phosphodiester bond.D) The disaccharide is formed by the hydrolysis of two monosaccharides.

The disaccharide contains a peptide bond between its units.

The two monosaccharides are linked by a phosphodiester bond.

The two monosaccharide units are joined by a glycosidic bond.

The disaccharide is formed by the hydrolysis of two monosaccharides.

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Verified step by step guidance

Step 1: Understand the structure of a disaccharide. A disaccharide is a carbohydrate composed of two monosaccharide units linked together by a covalent bond. This bond is typically a glycosidic bond, which forms through a dehydration reaction (loss of a water molecule).

Step 2: Analyze the options provided. Option A mentions a glycosidic bond, which is the correct type of bond that links two monosaccharides in a disaccharide. Option B mentions a peptide bond, which is found in proteins, not carbohydrates. Option C mentions a phosphodiester bond, which is found in nucleic acids, not disaccharides. Option D incorrectly states that a disaccharide is formed by hydrolysis, which is the process of breaking bonds using water, not forming them.

Step 3: Recall the process of disaccharide formation. Disaccharides are formed by a condensation reaction (dehydration synthesis), where a hydroxyl group (-OH) from one monosaccharide reacts with a hydrogen atom (-H) from another monosaccharide, releasing a water molecule and forming a glycosidic bond.

Step 4: Eliminate incorrect options based on the above analysis. Peptide bonds (Option B) and phosphodiester bonds (Option C) are not relevant to disaccharides. Hydrolysis (Option D) is the reverse process of disaccharide formation, so it is also incorrect.

Step 5: Conclude that the correct answer is Option A, as the two monosaccharide units in a disaccharide are joined by a glycosidic bond, which is consistent with the structure and formation of disaccharides.