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 is NOT an example of a carbohydrate?

Cellulose

Cholesterol

Glucose

Sucrose

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Verified step by step guidance

Step 1: Understand the definition of carbohydrates. Carbohydrates are organic molecules composed of carbon (C), hydrogen (H), and oxygen (O) atoms, typically in a ratio of 1:2:1. They serve as energy sources and structural components in living organisms.

Step 2: Review the examples provided in the question. Cellulose, glucose, and sucrose are all carbohydrates. Cholesterol, however, is a lipid, not a carbohydrate. Lipids are hydrophobic molecules primarily composed of carbon and hydrogen, and they include fats, oils, and steroids.

Step 3: Analyze the molecular structure of each option. For example, glucose (C₆H₁₂O₆) is a monosaccharide, sucrose (C₁₂H₂₂O₁₁) is a disaccharide, and cellulose is a polysaccharide made of glucose units. Cholesterol, on the other hand, has a steroid structure with a hydroxyl group (-OH) and is not composed of carbohydrate monomers.

Step 4: Recall the biological roles of these molecules. Carbohydrates like glucose and sucrose are involved in energy metabolism, while cellulose provides structural support in plant cell walls. Cholesterol is involved in membrane fluidity and serves as a precursor for steroid hormones.

Step 5: Conclude that cholesterol is the correct answer because it does not fit the definition or structural characteristics of carbohydrates, unlike the other options provided.