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 statements about sterols is true?

Sterols lack the four fused ring structure typical of steroids.

Sterols are a subclass of steroids characterized by a hydroxyl group at the C-3 position of the A-ring.

Sterols are composed exclusively of amino acids.

Sterols are primarily found in nucleic acids.

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Verified step by step guidance

Step 1: Begin by understanding the term 'sterols.' Sterols are a subclass of steroids, which are organic compounds characterized by a four-fused ring structure known as the steroid nucleus. This structure is a hallmark of steroids and sterols.

Step 2: Recognize the defining feature of sterols. Sterols are distinguished from other steroids by the presence of a hydroxyl (-OH) group attached to the C-3 position of the A-ring in their structure. This hydroxyl group is a key characteristic of sterols.

Step 3: Eliminate incorrect options. For example, sterols are not composed exclusively of amino acids, as they are lipid molecules. Similarly, sterols are not primarily found in nucleic acids; they are found in cell membranes and play roles in membrane fluidity and signaling.

Step 4: Address the statement about the four-fused ring structure. Sterols do not lack this structure; in fact, they possess it, as it is a defining feature of steroids, including sterols.

Step 5: Conclude that the correct answer is the statement: 'Sterols are a subclass of steroids characterized by a hydroxyl group at the C-3 position of the A-ring,' as this accurately describes the structural and functional characteristics of sterols.