Choose the incorrect sentence .

Options

A. Prokaryotic cells do not have a nuclear membrane
B. Eukaryotic cells have well-defined cell organelles
C. Prokaryotic cells can be both microscopic and macroscopic
D. Both prokaryotic cells and eukaryotic cells have cytoplasm

Answer

To solve the question "Choose the incorrect sentence," we will analyze each provided statement about prokaryotic and eukaryotic cells to identify which one is incorrect.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "Prokaryotic cells do not have a nuclear membrane."
- **Analysis:** This statement is correct. Prokaryotic cells lack a well-defined nucleus and do not have a nuclear membrane.

2. **Analyze the Second Statement:**
- **Statement:** "Eukaryotic cells have well-defined cell organelles."
- **Analysis:** This statement is also correct. Eukaryotic cells contain well-defined organelles, including a nucleus that is enclosed by a nuclear membrane.

3. **Analyze the Third Statement:**
- **Statement:** "Prokaryotic cells are both microscopic and macroscopic."
- **Analysis:** This statement is incorrect. Prokaryotic cells are primarily microscopic. They are mostly single-celled organisms like bacteria and do not form macroscopic structures.

4. **Analyze the Fourth Statement:**
- **Statement:** "Both prokaryotic cells and eukaryotic cells have cytoplasm."
- **Analysis:** This statement is correct. Both types of cells contain cytoplasm, which is the gel-like substance within the cell membrane.

### Conclusion:
The incorrect statement among the options provided is the third one: "Prokaryotic cells are both microscopic and macroscopic."

---