Choose the wrong statement

Options

A. Both chloroplasts and Mitochondria have r RNA
B. Chloroplasts are larger than mitochondria
C. Mg is required for binding of ribosomal subunits
D. 80S ribosomes are attached to the outer surface of inner membrane of nuclear envelope

Answer

To solve the question of identifying the wrong statement, we will analyze each statement one by one based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Understanding rRNA**:
- Ribosomal RNA (rRNA) is a type of RNA that is essential for protein synthesis. It forms the core of ribosome's structure and catalyzes protein synthesis.

2. **Analyzing Statement 1**:
- "Both Chloroplast and Mitochondria have rRNA."
- **Analysis**: Both organelles are known to contain their own ribosomes and rRNA. Therefore, this statement is **correct**.

3. **Analyzing Statement 2**:
- "Chloroplasts are larger than mitochondria."
- **Analysis**: Chloroplasts are indeed larger than mitochondria, making this statement **correct**.

4. **Analyzing Statement 3**:
- "Magnesium is required for binding of ribosomal units."
- **Analysis**: Magnesium ions are known to play a crucial role in stabilizing the binding of ribosomal subunits. Hence, this statement is also **correct**.

5. **Analyzing Statement 4**:
- "80S ribosomes are attached to the outer surface of the inner membrane of the nuclear envelope."
- **Analysis**: This statement is incorrect because 80S ribosomes do not exist as a separate entity; rather, they are composed of 60S and 40S subunits. The ribosomes associated with the endoplasmic reticulum are indeed 80S, but they are not specifically attached to the nuclear envelope in the manner described. Thus, this statement is **wrong**.

### Conclusion:
The wrong statement is the fourth one: "80S ribosomes are attached to the outer surface of the inner membrane of the nuclear envelope."

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