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

10. Lipids

Steroids

Biochemistry

10. Lipids

Steroids

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Multiple Choice

Which of the following is NOT a steroid?

Cortisol

Testosterone

Cholesterol

Insulin

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Verified step by step guidance

Understand the definition of a steroid: Steroids are a class of lipids characterized by a core structure of four fused carbon rings (three cyclohexane rings and one cyclopentane ring). They are derived from cholesterol and include hormones like cortisol, testosterone, and others.

Analyze the chemical structure of each option: Cortisol, testosterone, and cholesterol all share the characteristic steroid structure of four fused rings, making them steroids.

Consider the structure and function of insulin: Insulin is a peptide hormone composed of amino acids, not a lipid. It does not have the four-ring steroid structure and is synthesized in the pancreas as a protein hormone.

Compare insulin to the other options: Insulin is fundamentally different from steroids in both structure and function. It regulates glucose metabolism, whereas steroids often act as signaling molecules for various physiological processes.

Conclude that insulin is NOT a steroid because it lacks the defining structural features of steroids and is classified as a peptide hormone instead.