Which of the following is not true of a eukaryotic cell

Options

A. It has 8Os type of ribosome present in the mitochondria
B. It has 8Os type of ribosome present in the cytoplasm
C. Mitochondria contain circular DNA
D. Membrane bound organelles are present

Answer

To determine which statement is not true regarding eukaryotic cells, let's analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Eukaryotic Cells**:
- Eukaryotic cells are characterized by having a well-defined nucleus and membrane-bound organelles. This is a fundamental feature that distinguishes them from prokaryotic cells.

2. **Analyzing the Options**:
- **Option 1**: "It has 70S type of ribosome present in the mitochondria."
- This statement is **true**. Mitochondria, being semi-autonomous organelles, contain 70S ribosomes, which are similar to those found in prokaryotes.

- **Option 2**: "It has 80S type of ribosome present in the cytoplasm."
- This statement is also **true**. Eukaryotic cells have 80S ribosomes in their cytoplasm, which are larger than the 70S ribosomes found in mitochondria and chloroplasts.

- **Option 3**: "Mitochondria contain circular DNA."
- This statement is **true**. Mitochondria do indeed contain their own circular DNA, which is a characteristic feature of semi-autonomous organelles.

- **Option 4**: "Membrane-bound organelles are present."
- This statement is **true**. Eukaryotic cells are defined by the presence of membrane-bound organelles, such as the nucleus, endoplasmic reticulum, Golgi apparatus, etc.

3. **Identifying the False Statement**:
- Upon reviewing all the options, all statements provided are true regarding eukaryotic cells. However, if we consider the context of ribosome types:
- The statement regarding the presence of "80S type of ribosome in the cytoplasm" is true, but if there was a statement suggesting that "70S ribosomes are present in the cytoplasm," that would be false. Since the question asks for what is not true, we can conclude that the false statement is likely a misinterpretation of the ribosome types in organelles versus the cytoplasm.

### Conclusion:
The statement that is not true of a eukaryotic cell is the one that incorrectly identifies the type of ribosome present in the cytoplasm or organelles.