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

What is the effect of cholesterol in a membrane?

Increases membrane fluidity by preventing acyl chain packing.

Reduces membrane fluidity acyl chain movement.

Both a & b.

Neither a or b.

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Verified step by step guidance

Understand the role of cholesterol in biological membranes: Cholesterol is a lipid molecule that is interspersed within the phospholipid bilayer of cell membranes.

Recognize that cholesterol has a dual role in membrane fluidity: It can both increase and decrease membrane fluidity depending on the temperature and the specific lipid environment.

At low temperatures, cholesterol increases membrane fluidity by preventing the fatty acid chains of phospholipids from packing tightly together. This is because cholesterol disrupts the regular packing of the acyl chains, thus preventing the membrane from becoming too rigid.

At high temperatures, cholesterol reduces membrane fluidity by restraining the movement of phospholipid fatty acid chains. This is because cholesterol's rigid ring structure provides a stabilizing effect, making the membrane less fluid.

Conclude that cholesterol's effect on membrane fluidity is context-dependent, and it can both increase and decrease fluidity, which aligns with option D: Both a & b.