Choose the option that has only correct statements :
(i) Inclusion bodies which are found in prokaryotic cells are not bounded by any membrane system
(ii) Ribosomes are the site of protein synthesis.
(iii) Pili are the surface structures of the bacteria which may play a role in motility.
(iv) The cell membrane of prokaryotes is structurally similar to the eukaryotes

Options

A. i, ii, iii and iv
B. ii, iii and iv
C. i, ii and iv
D. i, iii and iv

Answer

To solve the question, we will evaluate each statement one by one to determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement (i)**:
- **Statement**: Inclusion bodies which are found in prokaryotic cells are not bounded by any membrane system.
- **Analysis**: Inclusion bodies are indeed found in prokaryotic cells and are not surrounded by any membrane. They serve as storage for nutrients or other materials.
- **Conclusion**: This statement is **correct**.

2. **Evaluate Statement (ii)**:
- **Statement**: Ribosomes are the site of protein synthesis.
- **Analysis**: Ribosomes are the cellular structures responsible for synthesizing proteins by translating messenger RNA (mRNA). This is true for both prokaryotic and eukaryotic cells.
- **Conclusion**: This statement is **correct**.

3. **Evaluate Statement (iii)**:
- **Statement**: Pili are the surface structures of the bacteria which may play a role in motility.
- **Analysis**: While pili are indeed surface structures of bacteria, they primarily serve functions such as attachment to surfaces and genetic exchange (conjugation) rather than motility. The structures that facilitate motility in bacteria are flagella.
- **Conclusion**: This statement is **incorrect**.

4. **Evaluate Statement (iv)**:
- **Statement**: The cell membrane of prokaryotes is structurally similar to the eukaryotes.
- **Analysis**: The cell membrane of prokaryotes (bacteria) and eukaryotes (such as plant and animal cells) both consist of a phospholipid bilayer and proteins, making them structurally similar.
- **Conclusion**: This statement is **correct**.

### Final Conclusion:
Based on the evaluations:
- Correct statements: (i), (ii), and (iv).
- Incorrect statement: (iii).

Thus, the option that contains only the correct statements is the one that includes statements (i), (ii), and (iv).