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

The sex hormones estrogen, progesterone, and testosterone belong to which class of molecules?

Steroids

Glycolipids

Triglycerides

Phospholipids

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Verified step by step guidance

Step 1: Begin by understanding the structural and functional characteristics of the sex hormones mentioned in the problem: estrogen, progesterone, and testosterone. These hormones are derived from cholesterol and share a common steroid backbone.

Step 2: Recall the definition of steroids. Steroids are a class of lipids characterized by a core structure of four fused rings (three cyclohexane rings and one cyclopentane ring). This structure is known as the steroid nucleus.

Step 3: Compare the structural features of the sex hormones to the other options provided: glycolipids, triglycerides, and phospholipids. Glycolipids contain carbohydrate groups, triglycerides are composed of glycerol and three fatty acids, and phospholipids consist of glycerol, fatty acids, and a phosphate group. None of these match the steroid structure.

Step 4: Recognize that the sex hormones are synthesized from cholesterol, which is itself a steroid. This confirms that estrogen, progesterone, and testosterone belong to the steroid class of molecules.

Step 5: Conclude that the correct answer is 'Steroids' based on the structural and biosynthetic evidence provided in the previous steps.