New cell membrane during animal cytokinesis arises from

Options

A. endoplasmic reticulum
B. Golgi bodies
C. nucleus
D. microfilaments

Answer

**Step-by-Step Solution:**

1. **Understanding Cytokinesis:**
- Cytokinesis is the process during cell division where the cytoplasm of a parental cell is divided into two daughter cells. In animal cells, this process involves the formation of a new cell membrane.

2. **Identifying the Source of New Cell Membrane:**
- During cytokinesis, the new cell membrane must be formed to enclose each daughter cell. This membrane is primarily composed of lipids and proteins.

3. **Considering the Options:**
- **Option A: Endoplasmic Reticulum (ER)** - The ER is a continuous membrane system that plays a crucial role in lipid synthesis.
- **Option B: Golgi Bodies** - While Golgi bodies are involved in modifying and packaging proteins and lipids, they do not directly form the new cell membrane during cytokinesis.
- **Option C: Nucleus** - The nucleus is involved in genetic material organization and does not contribute to membrane formation during cytokinesis.
- **Option D: Microfilaments** - Microfilaments are part of the cytoskeleton and help in the physical process of cell division but do not directly form the cell membrane.

4. **Analyzing the Role of Endoplasmic Reticulum:**
- The smooth endoplasmic reticulum (SER) is specifically responsible for synthesizing lipids, including phospholipids and cholesterol, which are essential components of the cell membrane.

5. **Conclusion:**
- Based on the functions of the smooth endoplasmic reticulum in synthesizing the necessary lipids for membrane formation, we conclude that the new cell membrane during animal cytokinesis arises from the endoplasmic reticulum.

**Final Answer:**
The new cell membrane during animal cytokinesis arises from the endoplasmic reticulum.

---