Which one is an extracytoplasmic cell organelle

Options

A. Vacuole
B. E.R.
C. Golgi apparatus
D. Nucleus

Answer

**Step-by-Step Solution:**

1. **Understanding Cell Organelles:**
- Cell organelles are specialized structures within a cell that perform distinct functions. They can be membrane-bound or non-membrane-bound.

2. **Defining Extracytoplasmic Organelles:**
- Extracytoplasmic organelles refer to structures that are not part of the cytoplasm. The cytoplasm includes everything within the cell membrane, excluding the nucleus.

3. **Identifying the Options:**
- The question asks for an extracytoplasmic cell organelle. Common organelles include mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, vacuoles, and lysosomes, all of which are located within the cytoplasm.

4. **Recognizing the Nucleus:**
- The nucleus is a membrane-bound organelle that contains the cell's genetic material. It is surrounded by the nuclear membrane and is not considered part of the cytoplasm.

5. **Conclusion:**
- Since the nucleus is the only organelle that is not included in the cytoplasm, it qualifies as an extracytoplasmic organelle.

**Final Answer:**
- The extracytoplasmic cell organelle is the **nucleus**.

---