Which is correct option amongst the following statements ?
a. Nuclear membrane, chloroplasts, mitochondria, microtubules and pili are absent in prokaryotic cells
b. Nuclear membrane, chloroplasts, mitochondria, microtubules and pili are present in eukaryotic cells
c. Ribosomes are 70S in prokaryotic cells, chloroplasts and mitochondria. They are 80S in animal cells.

Options

A. a and b are wrong, c is correct
B. a is correct , b and c are wrong
C. a and b are correct, c is wrong
D. a and c are correct, b is wrong

Answer

To solve the question regarding which statement is correct among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze Statement A**:
- The statement claims that "Nuclear membrane, chloroplasts, mitochondria, microtubules, and pili are absent in prokaryotic cells."
- **Evaluation**:
- Prokaryotic cells do not have a nuclear membrane, chloroplasts, or mitochondria.
- However, pili (or pilus) are indeed present in prokaryotic cells and are important for processes like bacterial conjugation.
- **Conclusion**: This statement is **incorrect** because it incorrectly states that pili are absent.

2. **Analyze Statement B**:
- The statement claims that "Nuclear membrane, chloroplasts, mitochondria, microtubules, and pili are present in eukaryotic cells."
- **Evaluation**:
- Eukaryotic cells do have a nuclear membrane, mitochondria, and microtubules.
- However, pili are not present in eukaryotic cells; they are specific to prokaryotic cells.
- **Conclusion**: This statement is also **incorrect** because it incorrectly states that pili are present.

3. **Analyze Statement C**:
- The statement claims that "Ribosomes are 70S in prokaryotic cells, chloroplasts, and mitochondria. They are 80S in animal cells."
- **Evaluation**:
- Ribosomes in prokaryotic cells, as well as in chloroplasts and mitochondria, are indeed of the 70S type.
- In contrast, ribosomes in eukaryotic cells (including animal cells) are of the 80S type.
- **Conclusion**: This statement is **correct**.

### Final Answer:
The correct option is **C**: "Ribosomes are 70S in prokaryotic cells, chloroplasts, and mitochondria. They are 80S in animal cells."

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