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Practical Work on Food Tests

You have isol...

Question

You have isolated an unidentified liquid from a sample of beans. You add the liquid to a beaker of water and shake vigorously. After a few minutes, the water and the other liquid separate into two layers. To which class of biological molecules does the unknown liquid most likely belong?

A

Monosaccharide

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B

Lipid

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C

Globular protein

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D

Maltose

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Solution

The correct option is B Lipid
Lipids are the esters of fatty acid and alcohol. These are hydrophobic which means they are insoluble in water but soluble in benzene, ether and chloroform. As these are insoluble in water, they separate to form two layers when they are added with water.

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