Lipids are the biomolecules of choice for storage of metabolic energy because they:

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The question asks why lipids are the biomolecules of choice for storing metabolic energy.
Option a: 'a. yield a large amount of energy upon oxidation.' Correct. Fats store energy efficiently because their carbon-hydrogen bonds are highly reduced, yielding roughly 9 kcal per gram when oxidized, which is more energy per gram than carbohydrates or proteins. This high energy density makes them ideal for long-term energy storage.
Option b: 'b. are soluble in water.' This is incorrect. Lipids are largely hydrophobic and insoluble in water, which actually makes them compact energy stores without disturbing aqueous cellular environments. Water solubility would impede dense energy storage.
Option c: 'c. are highly oxidized.' This is false. Lipids are not highly oxidized; they are relatively reduced compounds. High oxidation state would release less energy upon oxidation, opposite of what fats provide as energy reserves.
Option d: 'd. are easily hydrolyzed.' While lipids can be hydrolyzed by lipases to release fatty acids, this property is about mobilization, not the fundamental reason for their high energy content. The ease of hydrolysis relates to mobilization rate, not why fats store more energy per gram.
Option e: 'e. are amphipathic.' Lipids can be amphipathic (having both hydrophobic and hydrophilic parts) in certain molecules like phospholipids, which is essential for membrane structure, not for energy storage. Storage lipids (triacylglycerols) are predominantly nonpolar and hydrophobic, optimized for energy density rather than membrane function.

Lipids are the biomolecules of choice for storage of metabolic energy because they:

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