Arrange these following four molecules in increasing order...

Arrange these following four molecules in increasing order of their biological energy content (per mole): (a) Sucrose (b) Myristic acid, $\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{12} \mathrm{COOH}$ (c) Glucose (d) Capric acid, $\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{8} \mathrm{COOH}$

Arrange these following four molecules in increasing order of their biological energy content (per mole):
(a) Sucrose
(b) Myristic acid, $\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{12} \mathrm{COOH}$
(c) Glucose
(d) Capric acid, $\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{8} \mathrm{COOH}$

Key Concepts

Degree of Reduction

The degree of reduction refers to how many electrons are available in a molecule for oxidation, which directly correlates with its potential energy release during metabolic processes. Molecules that are highly reduced, like long-chain fatty acids, typically yield more energy when oxidized than less reduced molecules like carbohydrates, making this concept key in understanding the differences in biological energy content among various molecules.

Carbohydrates

Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen, and they serve primarily as immediate energy sources in biological systems. They include molecules such as glucose (a monosaccharide) and sucrose (a disaccharide). In metabolism, carbohydrates yield energy through pathways like glycolysis and the citric acid cycle, but generally provide less energy per mole compared to more reduced molecules like fatty acids.

Biological Energy Content

This concept involves the amount of energy that can be released from a molecule when it is completely oxidized, typically measured in kilojoules or kilocalories per mole. It reflects the efficiency of the molecule as a fuel for biological processes and is central in comparing molecules based on the energy they provide in metabolic pathways.

Fatty Acids

Fatty acids are long-chain carboxylic acids that are more reduced than carbohydrates, meaning they have a higher proportion of carbon-hydrogen bonds relative to oxygen. This higher degree of reduction allows them to release a greater amount of energy upon oxidation. In bioenergetics, fatty acids such as capric acid and myristic acid are significant because their energy yield increases with chain length, making them more energy-dense fuel sources.

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