Does respiration release more energy from 1 gram of fat than from 2 grams of glucose?
To compare the energy release from 1 gram of fat and 2 grams of glucose through respiration, we need to consider the energy content of each substance.
One gram of fat provides approximately 9 calories (37.8 kilojoules) of energy when completely metabolized. On the other hand, one gram of glucose provides approximately 4 calories (16.7 kilojoules) of energy when completely metabolized.
To determine which substance releases more energy, we need to calculate the total energy released from each.
For 1 gram of fat:
Energy released = 9 calories (37.8 kilojoules)
For 2 grams of glucose:
Energy released = 4 calories (16.7 kilojoules) x 2 = 8 calories (33.4 kilojoules)
Therefore, 1 gram of fat releases more energy than 2 grams of glucose.