Semmelweis Medicine Biology Entrance Practice Exam 2025 - Free Practice Questions and Study Guide

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How do lipids behave in different solvents?

They are polar and soluble in water

They are non-polar and insoluble in water

Lipids are primarily non-polar molecules characterized by long hydrocarbon chains, which give them hydrophobic properties. This structure explains their behavior in different solvents. When placed in water, which is a polar solvent, lipids do not dissolve effectively. Instead, they tend to aggregate to minimize their exposure to water, a phenomenon commonly observed in biological membranes where phospholipids form bilayers.

In contrast, lipids do dissolve well in non-polar organic solvents, such as hexane or chloroform. In these environments, the non-polar nature of lipids aligns with the non-polar properties of the solvents, allowing for favorable interactions that lead to solubility.

This understanding of lipid behavior in solvents is crucial for applications in biochemistry, as it underscores the importance of lipid solubility when studying cellular structures and functions.

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They are soluble in both water and organic solvents

They are neutral and behave the same in all solvents

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