Concept explainers
To determine: The site where the largest amount of biologically active energy is available in triacylglycerols. in .
Introduction:
The most common form of lipid present in diet is a fat called triglycerides. Triglycerides or triacylglycerols are made up of three molecules of fatty acids and one glycerol molecule.

Explanation of Solution
The process of oxidation of fatty acids results in electron release from fatty acid which moves through respiratory chain to form molecules of ATP
The released fatty acid is then oxidized by the process of beta oxidation to form acetyl co enzyme A which enters the citric acid cycle and releases energy. Biologically available energy present in fatty acid chains is about 95% whereas it is only 5% in glycerol molecules. Thus, fatty acid is the site where largest amount of biologically active available energy is stored.
Fatty acid in triacylglycerols is the site where most of the biologically available energy is stored.
To explain: The way in which the knowledge of chemical structure of triacylglycerols helps in determining the site of largest amount of biological energy in triacylglycerols.
Introduction:
The most common form of lipid present in diet is a fat called triglycerides. Triglyceride or triacylglycerols is made up of three molecules of fatty acid and one glycerol molecule.

Explanation of Solution
The structural characteristics of fatty acid make them the site for large amount of energy. Long alkyl chains of fatty acids are greatly reduced that have high oxidation energy. The carbon molecules in fatty acid are greatly reduced as compared to glycerol.
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Chapter 17 Solutions
Lehninger Principles of Biochemistry (Instructor's)
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