Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

32. Lipids

Intro to Lipids

Organic Chemistry

32. Lipids

Intro to Lipids

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Multiple Choice

How does cholesterol affect the plasma membrane at low temperatures?

It increases membrane fluidity by preventing tight packing of phospholipids.

It decreases membrane fluidity by promoting tight packing of phospholipids.

It causes the membrane to become more permeable to ions.

It has no effect on membrane fluidity at low temperatures.

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Verified step by step guidance

Understand the structure of cholesterol: Cholesterol is a lipid molecule with a hydrophobic tail and a hydroxyl group that interacts with the phospholipid bilayer of the plasma membrane.

Recognize the role of cholesterol in the membrane: Cholesterol is interspersed among the phospholipids in the membrane, affecting its fluidity and stability.

Consider the effect of temperature on membrane fluidity: At low temperatures, phospholipids tend to pack tightly, reducing membrane fluidity.

Analyze how cholesterol affects phospholipid packing: Cholesterol disrupts the regular packing of phospholipids, preventing them from becoming too tightly packed, thus increasing fluidity.

Conclude the impact of cholesterol at low temperatures: By preventing tight packing, cholesterol increases membrane fluidity at low temperatures, contrary to promoting tight packing or having no effect.