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 structural features is characteristic of cholesterol?

A long unbranched hydrocarbon chain with a terminal carboxyl group

A glycerol backbone esterified to three fatty acids

A fused four-ring (steroid) structure with a hydroxyl group at C3

A phosphate group attached to a glycerol backbone and two fatty acids

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Verified step by step guidance

Step 1: Begin by identifying the structural features of cholesterol. Cholesterol is a type of lipid classified as a sterol, which is a subgroup of steroids.

Step 2: Recall that steroids are characterized by a fused four-ring structure. Specifically, cholesterol has three six-membered rings and one five-membered ring fused together.

Step 3: Note that cholesterol also contains a hydroxyl (-OH) group attached to the carbon at position C3 of the steroid nucleus. This hydroxyl group contributes to its amphipathic nature.

Step 4: Compare the structural features of cholesterol to the options provided. Eliminate options that describe other types of lipids, such as fatty acids, triglycerides, or phospholipids, which do not have the steroid nucleus.

Step 5: Conclude that the correct structural feature of cholesterol is 'A fused four-ring (steroid) structure with a hydroxyl group at C3,' as this matches the defining characteristics of cholesterol.