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 the only molecule that the body can burn as a source of energy under both aerobic and anaerobic conditions?

Fatty acids

Amino acids

Fructose

Glucose

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Verified step by step guidance

Understand the context: The question is asking which molecule can be metabolized by the body to produce energy under both aerobic (with oxygen) and anaerobic (without oxygen) conditions. This requires knowledge of metabolic pathways.

Recall the metabolic pathways: Glucose is the primary molecule used in glycolysis, a pathway that occurs in the cytoplasm and does not require oxygen (anaerobic). Under aerobic conditions, glucose is further metabolized in the mitochondria via the citric acid cycle and oxidative phosphorylation.

Compare the options: Fatty acids and amino acids require oxygen for their complete metabolism (aerobic conditions only). Fructose is metabolized into intermediates that enter glycolysis, but it is not the primary molecule used under anaerobic conditions.

Focus on glucose: Glucose is unique because it can undergo glycolysis to produce ATP anaerobically, forming pyruvate and lactate. Under aerobic conditions, pyruvate enters the mitochondria for further energy production.

Conclude: Based on the metabolic pathways, glucose is the only molecule that can provide energy under both aerobic and anaerobic conditions, making it the correct answer.