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

Compared to carbohydrates and lipids, which of the following macromolecules is least likely to be used as a primary energy source in cells?

Triglycerides

Proteins

Monosaccharides

Polysaccharides

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Verified step by step guidance

Understand the role of macromolecules in energy metabolism: Carbohydrates, lipids, and proteins are all macromolecules that can be metabolized to provide energy. However, their primary roles in the cell differ significantly.

Recognize the primary energy sources: Carbohydrates, such as monosaccharides (e.g., glucose) and polysaccharides (e.g., glycogen), are the most readily used macromolecules for energy production due to their efficient breakdown in glycolysis and subsequent pathways like the citric acid cycle.

Understand the role of lipids: Lipids, such as triglycerides, are stored as long-term energy reserves. They are metabolized through beta-oxidation to produce acetyl-CoA, which enters the citric acid cycle for energy production. Lipids provide more energy per gram compared to carbohydrates but are not as rapidly mobilized.

Examine the role of proteins: Proteins are primarily used for structural and functional purposes, such as enzyme activity, signaling, and cellular repair. While proteins can be broken down into amino acids and used for energy via gluconeogenesis or direct entry into metabolic pathways, this is not their primary role and typically occurs under conditions of starvation or extreme energy demand.

Conclude the comparison: Based on their primary roles, proteins are least likely to be used as a primary energy source in cells compared to carbohydrates (monosaccharides and polysaccharides) and lipids (triglycerides).