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 best describes a liposome?

A single layer of phospholipids arranged with hydrophobic tails facing water

A linear polymer of fatty acids linked by peptide bonds

A spherical vesicle composed of one or more phospholipid bilayers enclosing an aqueous core

A protein complex that transports lipids in the bloodstream

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Verified step by step guidance

Understand the structure of a liposome: A liposome is a spherical vesicle composed of one or more phospholipid bilayers. Each bilayer consists of phospholipids arranged such that the hydrophilic (water-attracting) heads face outward toward the aqueous environment, while the hydrophobic (water-repelling) tails face inward, away from water.

Clarify the arrangement of phospholipids: In a liposome, the phospholipids form bilayers, not a single layer. The hydrophobic tails are shielded from water by being sandwiched between the hydrophilic heads, creating a stable structure.

Identify the aqueous core: The liposome encloses an aqueous core, which is surrounded by the phospholipid bilayers. This core can contain water-soluble substances, making liposomes useful for drug delivery and other applications.

Eliminate incorrect options: Review the other choices provided. A single layer of phospholipids with hydrophobic tails facing water is incorrect because hydrophobic tails do not interact with water. A linear polymer of fatty acids linked by peptide bonds is incorrect because fatty acids are not linked by peptide bonds, which are specific to proteins. A protein complex that transports lipids in the bloodstream describes lipoproteins, not liposomes.

Conclude with the correct description: Based on the structural and functional characteristics of liposomes, the correct answer is 'A spherical vesicle composed of one or more phospholipid bilayers enclosing an aqueous core.'