Which macromolecule serves as the primary long-term energy storage molecule in animal cells?
- A. Fat (lipid) ✓
- B. Protein
- C. Nucleic acid
- D. Starch
Correct answer
A. Fat (lipid)
Explanation
Fats (lipids) store roughly twice the energy per gram compared to carbohydrates and serve as the primary long-term energy reserve in animals; starch is the plant equivalent.