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 body's primary source of energy under normal physiological conditions?

Fatty acids

Amino acids

Glucose

Nucleic acids

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Verified step by step guidance

Understand the concept of primary energy sources: Under normal physiological conditions, the body relies on a specific macronutrient for energy. This is determined by the metabolic pathways that are most active and efficient in producing ATP, the energy currency of the cell.

Review glucose metabolism: Glucose is the primary source of energy because it is readily metabolized through glycolysis, the citric acid cycle, and oxidative phosphorylation to produce ATP. Glycolysis occurs in the cytoplasm and does not require oxygen, making it a versatile energy source.

Compare glucose to other macronutrients: Fatty acids are primarily used during prolonged fasting or exercise, while amino acids are used as a last resort during starvation or extreme conditions. Nucleic acids are not metabolized for energy under normal conditions.

Consider physiological conditions: Under normal conditions, the body maintains blood glucose levels through dietary intake and glycogen stores. This ensures a steady supply of glucose for tissues, especially the brain and red blood cells, which rely almost exclusively on glucose for energy.

Conclude why glucose is the correct answer: Glucose is the body's primary energy source under normal conditions due to its efficient metabolic pathways and its role in maintaining homeostasis. Fatty acids and amino acids serve as secondary or emergency energy sources.