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 structures represents a lipid?

A chain of nucleotides containing a sugar, phosphate, and nitrogenous base (nucleic acid)

A molecule composed of a glycerol backbone esterified to three fatty acid chains (triglyceride)

A polymer of amino acids linked by peptide bonds (polypeptide)

A polysaccharide composed of repeating glucose units (cellulose)

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Verified step by step guidance

Step 1: Understand the definition of a lipid. Lipids are a class of biomolecules that are hydrophobic or amphipathic in nature. They include fats, oils, phospholipids, and steroids. Triglycerides, specifically, are a type of lipid composed of a glycerol backbone esterified to three fatty acid chains.

Step 2: Analyze the given options. Each option represents a different type of biomolecule: nucleic acids, triglycerides, polypeptides, and polysaccharides. Identify which one matches the structural characteristics of a lipid.

Step 3: Evaluate the structure of a triglyceride. A triglyceride consists of a glycerol molecule (a three-carbon alcohol) bonded to three fatty acid chains via ester bonds. This structure is characteristic of lipids.

Step 4: Compare the triglyceride structure to the other options. Nucleic acids are composed of nucleotides (sugar, phosphate, and nitrogenous base), polypeptides are chains of amino acids linked by peptide bonds, and polysaccharides are polymers of sugars like glucose. None of these match the structural definition of a lipid.

Step 5: Conclude that the correct answer is the molecule composed of a glycerol backbone esterified to three fatty acid chains, as this structure represents a lipid (specifically, a triglyceride).