In both cyclic and non cyclic Photophosphorylation/electron transport

Options

A. ATP is produced
B. `P_(700)` is involved
C. quinone cycle operates
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding Photophosphorylation**:
- Photophosphorylation is the process of adding a phosphate group to ADP to form ATP using light energy. This occurs during photosynthesis in plants.

2. **Types of Photophosphorylation**:
- There are two main types of photophosphorylation: cyclic and non-cyclic.

3. **Cyclic Photophosphorylation**:
- In cyclic photophosphorylation, electrons move in a cyclic manner.
- Only ATP is produced in this process, and no coenzymes (like NADPH) are synthesized.
- This process involves Photosystem I (PSI), which absorbs light at a wavelength of 700 nm (P700).

4. **Non-Cyclic Photophosphorylation**:
- In non-cyclic photophosphorylation, electrons move in a non-cyclic manner.
- Both ATP and coenzymes (such as NADPH) are produced in this process.
- This process involves both Photosystem I (PSI) and Photosystem II (PSII), with PSII absorbing light at a wavelength of 680 nm (P680).

5. **Role of Quinone Cycle**:
- The quinone cycle is a series of reactions that occur during non-cyclic photophosphorylation, where oxidation and reduction reactions take place alternately.
- It is important for the transfer of electrons and the production of ATP and NADPH.

6. **Summary of Differences**:
- **Cyclic Photophosphorylation**: Produces ATP only, involves PSI (P700), and does not produce NADPH.
- **Non-Cyclic Photophosphorylation**: Produces both ATP and NADPH, involves both PSI (P700) and PSII (P680), and includes the quinone cycle.