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 basic ring structure is common to all steroids?

Imidazole ring

Benzene ring

Pyrimidine ring

Cyclopentanoperhydrophenanthrene ring

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Verified step by step guidance

Understand the question: The problem asks about the basic ring structure common to all steroids. Steroids are a class of organic compounds with a specific molecular framework.

Recall the structural features of steroids: Steroids are characterized by a core structure consisting of three six-membered cyclohexane rings and one five-membered cyclopentane ring fused together. This structure is known as cyclopentanoperhydrophenanthrene.

Eliminate incorrect options: Analyze the given options. Imidazole, benzene, and pyrimidine rings are not part of the steroid core structure. These rings are associated with other types of molecules, such as amino acids or nucleotides.

Focus on the correct answer: Cyclopentanoperhydrophenanthrene is the correct answer because it describes the fused ring system that forms the backbone of all steroid molecules.

Conclude with relevance: This ring structure is fundamental to the biological activity of steroids, as it provides the framework for functional groups that determine the specific properties of steroid hormones and other related compounds.