Which of the following molecules contains the highest amount of energy per gram?

Question

BlackTom AI · Accepted Answer

The question asks which molecule carries the greatest energy per gram among the given options.
Option 1: Phospholipid. As a lipid, phospholipids store energy in their long hydrocarbon chains, typically providing about 9 kcal (≈37 kJ) per gram, which is the highest among common macronutrients.
Option 2: Cellulose. Cellulose is a polysaccharide; while carbohydrates generally provide about 4 kcal per gram, cellulose is largely indigestible to humans and thus does not contribute usable energy in the same way as digestible carbs. Its energy value is effectively lower for our metabolic use.
Option 3: Glucose. Glucose is a simple carbohydrate that yields about 4 kcal per gram when metabolized, which is less than the energy per gram provided by lipids.
Option 4: Protein. Proteins deliver roughly 4 kcal per gram on average when metabolized for energy, which is again lower than lipids and glucose. Additionally, the body often uses proteins for structure and enzymes rather than as a primary energy source.
In summary, among these options, lipids (phospholipids) provide the highest energy per gram, followed by carbohydrates as a group, with proteins offering the least energy per gram in direct caloric terms.

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