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 form of lipid is primarily used by the human body for long-term energy storage?

Cholesterol

Phospholipids

Sphingolipids

Triacylglycerols (triglycerides)

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Verified step by step guidance

Step 1: Understand the role of lipids in the human body. Lipids are a diverse group of molecules that include fats, oils, and certain types of steroids. They serve various functions, such as energy storage, structural components of cell membranes, and signaling molecules.

Step 2: Recognize the types of lipids listed in the problem. Cholesterol is a steroid that plays a role in membrane fluidity and serves as a precursor for steroid hormones. Phospholipids are major components of cell membranes, forming bilayers. Sphingolipids are involved in cell signaling and membrane structure. Triacylglycerols (triglycerides) are the primary form of energy storage in the body.

Step 3: Recall the biochemical properties of triacylglycerols. Triacylglycerols consist of three fatty acid chains esterified to a glycerol backbone. They are hydrophobic and stored in adipose tissue, where they can be broken down into fatty acids and glycerol for energy during periods of fasting or increased energy demand.

Step 4: Compare the energy storage function of triacylglycerols to other lipids. While cholesterol, phospholipids, and sphingolipids have important structural and signaling roles, triacylglycerols are specifically adapted for long-term energy storage due to their high energy density and ability to be stored in large quantities without affecting cellular osmolarity.

Step 5: Conclude that triacylglycerols are the correct answer because they are the primary lipid used by the human body for long-term energy storage, as opposed to the other lipids listed, which serve different functions.