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

10. Lipids

Omega-3 Fatty Acids

Biochemistry

10. Lipids

Omega-3 Fatty Acids

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Multiple Choice

Assuming the standard shorthand naming system is used, which of the following is an omega-3 fatty acid?

a) 20:1Δ¹⁴
b) 18:3Δ^9,12,15
c) 20:1Δ^3,12
d) 18:2Δ^9,12

20:1Δ¹⁴

18:3Δ^9,12,15

20:1Δ^3,12

18:2Δ^9,12

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Verified step by step guidance

Understand the shorthand notation for fatty acids: The notation 'X:YΔa,b,c' represents a fatty acid with X carbon atoms, Y double bonds, and double bonds located at carbon positions a, b, and c from the carboxyl end.

Identify the omega-3 fatty acid: Omega-3 fatty acids have their first double bond at the third carbon from the methyl end (omega end) of the fatty acid chain.

Convert the shorthand notation to identify the omega position: For each option, subtract the position of the first double bond from the total number of carbons and add 1 to find the omega position.

Analyze option b) 18:3Δ9,12,15: Subtract 15 (the position of the first double bond) from 18 (total carbons) and add 1, resulting in 4, indicating it is an omega-3 fatty acid.

Verify other options: Repeat the conversion for other options to confirm they do not meet the omega-3 criteria, ensuring option b) is the correct choice.