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 statements is true about carbohydrates?

All carbohydrates are insoluble in water.

Carbohydrates are composed of carbon, hydrogen, and oxygen, typically in a 1:2:1 ratio.

Carbohydrates do not serve as an energy source in living organisms.

Cellulose is a disaccharide found in animal tissues.

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Verified step by step guidance

Step 1: Begin by analyzing the chemical composition of carbohydrates. Carbohydrates are organic molecules composed of carbon (C), hydrogen (H), and oxygen (O), typically in a 1:2:1 ratio. This is a defining characteristic of carbohydrates and is true for monosaccharides like glucose (C₆H₁₂O₆).

Step 2: Evaluate the solubility of carbohydrates in water. Many carbohydrates, especially monosaccharides and disaccharides, are soluble in water due to their hydroxyl (-OH) groups, which can form hydrogen bonds with water molecules. Therefore, the statement 'All carbohydrates are insoluble in water' is incorrect.

Step 3: Assess the role of carbohydrates as an energy source. Carbohydrates are a primary energy source in living organisms. For example, glucose is metabolized during cellular respiration to produce ATP, the energy currency of the cell. Thus, the statement 'Carbohydrates do not serve as an energy source in living organisms' is false.

Step 4: Examine the structure and classification of cellulose. Cellulose is a polysaccharide, not a disaccharide, and it is found in plant cell walls, not animal tissues. This makes the statement 'Cellulose is a disaccharide found in animal tissues' incorrect.

Step 5: Conclude that the correct statement is: 'Carbohydrates are composed of carbon, hydrogen, and oxygen, typically in a 1:2:1 ratio.' This aligns with the chemical definition and properties of carbohydrates.