Chapter 24.4, Problem 22LC

Interpretation Introduction

Interpretation: Physical properties that set lipids apart from biological substances such as carbohydrates and proteins need to be explained.

Concept Introduction: Lipids are hydrocarbon-containing molecules that form the basis for the structure and operation of living cells.

Answer to Problem 22LC

Carbohydrates and proteins are soluble in water whereas lipids are not.

Explanation of Solution

Given Information: Lipids are different from carbohydrates and proteins.

Since lipids are non-polar molecules with exclusively non-polar carbon-carbon or carbon-hydrogen connections, they are hydrophobic. Proteins and carbohydrates, on the other hand, can form hydrogen bonds with water because they are hydrophilic.

Conclusion

Carbohydrates and proteins are soluble in water whereas lipids are not.