Question

Lipids are insoluble in water because lipid
molecules are
(a) hydrophilic (b) hydrophobic
(c) neutral (d) zwitter ions

Answer 1

hydrophobic

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Answer 2

Lipids are insoluble in water because lipid molecules are - (b) hydrophobic

Lipids are molecules containing long chains of fatty acids. They are amphipathic in nature which means they have both hydrophobic and hydrophilic regions.

Hydrophobic regions are non-polar regions, which can not interact with polar solvents like water, rendering them insoluble. The hydrophilic region on another hand can interact with polar molecules.

The arrangement of the hydrophilic and hydrophobic region is such that, as a single layer, they form micelles and as bilayer, they form a double layered membrane.