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

Lipids

Biochemistry

1. Introduction to Biochemistry

Lipids

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Multiple Choice

Which of the following compounds cannot be formed from fatty acids?

Triglycerides

Glucose

Phospholipids

Ketone bodies

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Verified step by step guidance

Step 1: Begin by understanding the metabolic pathways of fatty acids. Fatty acids are primarily used for energy production, storage, and the synthesis of certain lipid-based molecules. They undergo β-oxidation to produce acetyl-CoA, which enters the citric acid cycle or is used for other biosynthetic processes.

Step 2: Analyze the formation of triglycerides. Fatty acids can combine with glycerol to form triglycerides, which are the main storage form of fats in the body. This process occurs in the liver and adipose tissue.

Step 3: Examine the synthesis of phospholipids. Fatty acids are integral components of phospholipids, which are essential for cell membrane structure. They combine with glycerol, phosphate groups, and other molecules to form phospholipids.

Step 4: Consider the production of ketone bodies. During prolonged fasting or carbohydrate deprivation, fatty acids are converted into ketone bodies (e.g., acetoacetate, β-hydroxybutyrate) in the liver to provide an alternative energy source for tissues like the brain.

Step 5: Evaluate the formation of glucose. Fatty acids cannot be converted into glucose because the conversion of acetyl-CoA (produced from fatty acid oxidation) into glucose is not possible due to the irreversible nature of the pyruvate dehydrogenase reaction. This is a key metabolic limitation in humans.