[Campbell Biology P.964] Which of the following statements about energy storage in the human... | Practice Question

Which of the following statements about energy storage in the human body is correct?

  • A: Glycogen is primarily stored in adipose cells as the most space-efficient energy reserve.
  • B: When fewer calories are taken in, the body first expends muscle glycogen before drawing on liver glycogen.
  • C: Oxidizing a gram of fat liberates approximately twice the energy liberated from a gram of carbohydrate or protein.
  • D: Liver and muscle cells store excess energy primarily as fat due to its higher energy density.

Explanation

The text explicitly states that "oxidizing a gram of fat liberates about twice the energy liberated from a gram of carbohydrate or protein," making fats the most energy-dense storage molecule. Liver and muscle cells store glycogen first, and then excess energy is stored as fat in adipose cells. Liver glycogen is typically utilized before muscle glycogen during calorie deficits.