(20 points ) which of the structures below represents a fat?

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The last one, D, is the correct answer. It represents a triglyceride.

Lipids/Fats always have C, O, H, but there ratio is not 1:2:1, like carbohydrates. Also, their functional group is not a Hydroxyl, but rather a carboxyl group. Here, you can see the carboxyl functional group.

A is wrong because there is P. B shows a polysaccharide because there are fixed amounts of C, O, H. Also, there is no carboxyl group but there is a hydroxyl group. C is completely wrong because there is a methyl group, which is not commonly present in lipids. D is correct.

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