Which of the following statements about prokaryotes is true?

Options

A. All prokaryotes have a cell wall
B. Nucleus is absent in all prokaryotes
C. Prokaryotes are larger than
D. Ribosomes are larger in prokaryotes as compared to eukaryotes

Answer

To determine which statement about prokaryotes is true, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Prokaryotes**:
Prokaryotes are simple, unicellular organisms that lack a membrane-bound nucleus and organelles. They are considered primitive forms of life.

2. **Analyzing Each Option**:
- **Option 1**: "All prokaryotes have a cell wall."
- This statement is **false** because there are exceptions, such as Mycoplasma, which is a type of prokaryote that does not have a cell wall.

- **Option 2**: "Nucleus is absent in all prokaryotes."
- This statement is **true**. Prokaryotes do not have a true nucleus; their genetic material is not enclosed within a membrane.

- **Option 3**: "Prokaryotes are larger than eukaryotes."
- This statement is **false**. Prokaryotes are generally smaller than eukaryotes.

- **Option 4**: "Ribosomes are larger in prokaryotes as compared to eukaryotes."
- This statement is **false**. Prokaryotic ribosomes are smaller (70S) compared to eukaryotic ribosomes (80S).

3. **Conclusion**:
After analyzing all the options, the only true statement about prokaryotes is that "Nucleus is absent in all prokaryotes."

### Final Answer:
The correct answer is **Option 2: Nucleus is absent in all prokaryotes.**

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