Which of the following will release more energy on oxidation ? Arrange them in ascending order.
(a) 1 gm of fat (b) 1 gm of protein (c) 1 gm of glucose (d) 0.25 gm of glucose + 0.5 g glucose.

Answer

To determine which of the given substances releases more energy upon oxidation, we need to consider the energy yield of each substance when metabolized. The substances to analyze are:

(a) 1 gm of fat
(b) 1 gm of protein
(c) 1 gm of glucose
(d) 0.25 gm of glucose + 0.5 gm of glucose (which totals 0.75 gm of glucose)

### Step-by-Step Solution:

1. **Understand Energy Yield**:
- Fats are known to provide the highest energy yield per gram when oxidized, followed by carbohydrates (like glucose), and then proteins, which yield the least energy.

2. **Energy Values**:
- **1 gm of fat**: Approximately 9 kcal of energy.
- **1 gm of protein**: Approximately 4 kcal of energy.
- **1 gm of glucose**: Approximately 4 kcal of energy.
- **0.75 gm of glucose (0.25 gm + 0.5 gm)**: This would yield approximately 3 kcal of energy (0.75 gm x 4 kcal/gm).

3. **Arrange in Ascending Order**:
- Start with the substance that releases the least energy:
- **0.75 gm of glucose** (3 kcal)
- **1 gm of protein** (4 kcal)
- **1 gm of glucose** (4 kcal)
- **1 gm of fat** (9 kcal)

4. **Final Arrangement**:
- The ascending order of energy release upon oxidation is:
- (d) 0.75 gm of glucose < (b) 1 gm of protein < (c) 1 gm of glucose < (a) 1 gm of fat

### Final Answer:
(d) 0.75 gm of glucose < (b) 1 gm of protein < (c) 1 gm of glucose < (a) 1 gm of fat

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