22 Biology -- Biomolecules

Yes,  ester may be lipid but note that only the ester of fatty acids are lipids. Esters (CH-O) are the bond formed between alcohol group and carboxylic acid  (-COOH) by the removal of a molecule of water. And if such bond is formed between fatty acid that's lipid. Similarly ester bond can also be formed between Penrose sugar and phosphate group in DNA to form phosphodiester bond which is actually not a lipid so be careful that only the ester bond between fatty acids can be considered as lipids.

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