Question

energy storage in humans
kcal per gram energy storage (kcal) life support time
free glucose in blood 4 40 few minutes
glycogen 4 600 - 1600 1 day
lipids (fats) 9 100,000 30 - 40 days
what is the best conclusion based on this data?
blood is a primary location for energy storage.
fat molecules contain more energy - containing bonds than simple sugars.
a gram of glycogen has twice as much energy as a gram of fat.
the human body stores approximately 1,000 kcal of glucose.

Explanation:

1. Analyze each option:

• Blood has only free - glucose with 40 kcal energy storage, so it's not a primary energy - storage location.
• Fat has 9 kcal per gram while free glucose and glycogen have 4 kcal per gram, indicating fat molecules have more energy - containing bonds.
• A gram of fat has more than twice the energy of a gram of glycogen (9 kcal vs 4 kcal).
• The body stores only 40 kcal of free glucose in blood and 600 - 1600 kcal of glycogen (not all glycogen is glucose), not approximately 1000 kcal of glucose.

Answer:

Fat molecules contain more energy - containing bonds than simple sugars.