To analyze the data provided in the table and determine the best conclusion, let's review and compare the information for each type of organic molecule:
1. Free Glucose in Blood:
- Keal per Gram: 4
- Energy Storage (Ikcel): 40
- Life Support Time: Few minutes
2. Glycogen:
- Keal per Gram: 4
- Energy Storage (Ikcel): 600-1500
- Life Support Time: 1 day
3. Lipids (Fats):
- Keal per Gram: 9
- Energy Storage (Ikcel): 100,000
- Life Support Time: 30-40 days
Now, let's evaluate each given possible conclusion:
1. Blood is a primary location for energy storage:
- This statement is not supported by the data. Free glucose, which is present in the blood, has a relatively small energy storage capacity (40 Ikcel) and can only support life for a few minutes. This suggests that blood is not the primary location for long-term energy storage.
2. Fat molecules contain more energy-containing bonds than simple sugars:
- This statement is supported by the data. Lipids (fats) have a higher energy content per gram (9 Keal per gram) compared to free glucose and glycogen (both 4 Keal per gram). Additionally, lipids have a significantly higher total energy storage capacity (100,000 Ikcel) and can support life for 30-40 days. This indicates that fats are able to store much more energy per gram than simple sugars.
3. A gram of glycogen has twice as much energy as a gram of fat:
- This statement is incorrect. The data shows that glycogen and free glucose both provide 4 Keal per gram, whereas fats provide 9 Keal per gram. Therefore, a gram of fat has more than twice the energy of a gram of glycogen.
Based on the data and the analysis, the best conclusion is:
Fat molecules contain more energy-containing bonds than simple sugars.
This conclusion reflects the fact that fats have a higher energy content per gram and greater total energy storage capacity, making them a much more efficient source of long-term energy storage in the body.
