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 substances is primarily composed of lipids?

Hemoglobin

Collagen

Triglycerides

Cellulose

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Verified step by step guidance

Step 1: Understand the composition of lipids. Lipids are a class of biomolecules that are hydrophobic or amphipathic, primarily composed of fatty acids and glycerol. Common examples include triglycerides, phospholipids, and sterols.

Step 2: Analyze the options provided. Hemoglobin is a protein responsible for oxygen transport in blood, composed of amino acids. Collagen is a structural protein found in connective tissues, also composed of amino acids. Cellulose is a carbohydrate made of glucose monomers linked by β-1,4-glycosidic bonds.

Step 3: Identify the substance primarily composed of lipids. Triglycerides are a type of lipid formed by the esterification of three fatty acids with a glycerol backbone. They are the main form of stored energy in animals.

Step 4: Compare the molecular composition of triglycerides with the other options. Unlike proteins (hemoglobin and collagen) and carbohydrates (cellulose), triglycerides are exclusively lipid-based molecules.

Step 5: Conclude that triglycerides are the correct answer because they are primarily composed of lipids, while the other substances belong to different biomolecular categories.