Which one of the following concerns photophosphorylation?

Options

A. ADP+AMP `overset"light energy"to` ATP
B. ADP + inorganic `PO_4 overset"light energy"to` ATP
C. ADP + inorganic `PO_4 to` ATP
D. AMP + inorganic `PO_4 overset"light energy"to` ATP

Answer

**Step-by-Step Solution:**

1. **Understanding Photophosphorylation**:
- Photophosphorylation refers to the process of forming ATP (adenosine triphosphate) in the presence of sunlight. The term can be broken down into "photo," meaning light, and "phosphorylation," which involves the addition of a phosphate group to ADP (adenosine diphosphate) to form ATP.

2. **Identifying the Components**:
- ATP is formed when ADP reacts with inorganic phosphate (Pi) in the presence of light energy. This is a crucial aspect of the photosynthesis process in plants.

3. **Analyzing the Options**:
- We need to evaluate each option provided to determine which one correctly describes photophosphorylation:
- **Option 1**: ADP reacting with adenosine monophosphate to form ATP. This is incorrect because ADP does not react with AMP to form ATP.
- **Option 2**: ADP reacting with inorganic phosphate in the presence of light energy to form ATP. This is correct as it describes the process of photophosphorylation accurately.
- **Option 3**: ADP reacting with inorganic phosphate without light energy. This is incorrect because light energy is essential for photophosphorylation.
- **Option 4**: AMP reacting with inorganic phosphate. This is incorrect because AMP does not participate in the formation of ATP in this context.

4. **Conclusion**:
- After analyzing all the options, the correct answer is **Option 2**: ADP reacts with inorganic phosphate in the presence of light energy to form ATP.