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

Which of the following best describes the chemical structure of an omega-3 fatty acid?

A polyunsaturated fatty acid with the first double bond at the third carbon from the methyl (omega) end

A saturated fatty acid with no double bonds

A polyunsaturated fatty acid with the first double bond at the sixth carbon from the methyl (omega) end

A monounsaturated fatty acid with a single double bond at the ninth carbon from the carboxyl end

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Verified step by step guidance

Step 1: Understand the term 'omega-3 fatty acid'. Omega-3 fatty acids are a type of polyunsaturated fatty acid characterized by the position of the first double bond relative to the methyl (omega) end of the molecule.

Step 2: Recall the definition of 'polyunsaturated fatty acid'. These fatty acids contain more than one double bond in their hydrocarbon chain.

Step 3: Identify the 'methyl (omega) end' of the fatty acid. The omega end refers to the terminal carbon furthest from the carboxyl group (-COOH). Counting starts from this end to locate the position of the first double bond.

Step 4: Compare the options provided. The correct description of an omega-3 fatty acid is a polyunsaturated fatty acid with the first double bond at the third carbon from the methyl (omega) end.

Step 5: Eliminate incorrect options. A saturated fatty acid has no double bonds, a monounsaturated fatty acid has only one double bond, and an omega-6 fatty acid has the first double bond at the sixth carbon from the methyl end. These do not match the definition of an omega-3 fatty acid.