GED Science Practice

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What is the primary characteristic of lipid molecules as mentioned in the content?

Insoluble in water
Soluble in water
High melting point
Yellow color

The correct answer is: Insoluble in water

Lipid molecules are characterized by being insoluble in water. This is a fundamental property of lipids due to their hydrophobic nature, meaning they do not have an affinity for water molecules. This property sets lipids apart from other types of molecules and is essential for their biological functions in living organisms. The other options are not primary characteristics of lipid molecules: being soluble in water goes against the nature of lipids, they do not have a high melting point like some solids, and their color may vary but there is no specific mention of lipids typically being yellow.