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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

10. Lipids

Fatty Acids

Biochemistry

10. Lipids

Fatty Acids

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Multiple Choice

What is the molecular formula of Linolenic acid, an 18-carbon polyunsaturated fatty acid with 3 double bonds?

a) C₁₈H₃₂O₂

b) C₁₈H₃₀O₂

c) C₂₈H₃₀O₂

d)C₁₈H₃₄O₂

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Verified step by step guidance

Understand the structure of Linolenic acid: It is an 18-carbon polyunsaturated fatty acid with 3 double bonds.

Recall the general formula for a saturated fatty acid: C_nH_2n+1COOH, where n is the number of carbon atoms.

For an 18-carbon saturated fatty acid, the formula would be C₁₈H₃₆O₂.

Each double bond in a fatty acid reduces the number of hydrogen atoms by 2. Since Linolenic acid has 3 double bonds, subtract 6 hydrogen atoms from the saturated formula.

Calculate the molecular formula by adjusting for the double bonds: C₁₈H_36-6O₂, which simplifies to C₁₈H₃₀O₂.