Which of the following concerns photophosphorylation

Options

A. `AMP + "inorganic "PO_(4) overset("Light energy")to ATP`
B. `ADP + AMP overset("Light energy")to ATP`
C. `ADP + "inorganic "PO_(4) overset("Light energy")to ATP`
D. `ADP + "inorganic"PO_(4) to ATP`

Explanation

**Step-by-Step Solution:**

1. **Understanding Photophosphorylation**: Photophosphorylation is the process of forming ATP (adenosine triphosphate) using light energy. It specifically occurs in the chloroplasts of plant cells.

2. **Role of Chloroplasts**: Chloroplasts contain thylakoid membranes that are essential for this process. These membranes absorb light energy, which is necessary for photophosphorylation.

3. **Formation of ATP**: The formation of ATP during photophosphorylation involves creating a concentration gradient of hydrogen ions (H+). The H+ ions accumulate inside the thylakoid lumen, creating a gradient compared to the cytoplasm.

4. **Activation of ATP Synthase**: When the concentration gradient is established, the ATP synthase enzyme, located on the thylakoid membrane, becomes activated. This enzyme facilitates the addition of an inorganic phosphate (Pi) to ADP (adenosine diphosphate) to form ATP.

5. **Energy Conversion**: The light energy absorbed by the chloroplasts is converted into chemical energy in the form of high-energy phosphate bonds in ATP. This stored energy can then be used for various metabolic processes in the plant.

6. **Identifying the Correct Option**: The question asks which option concerns photophosphorylation. The correct choice is the one that states ADP combines with inorganic phosphate in the presence of light energy to form ATP.

7. **Eliminating Incorrect Options**: Other options that mention AMP or incorrect combinations of ADP and AMP do not pertain to photophosphorylation and can be ruled out.

**Final Answer**: The correct option is the one that states ADP combines with inorganic phosphate to form ATP, specifically in the presence of light energy.

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