Cytoplasmic streaming and function of microvilli depend on

Options

A. microtubules
B. microfilaments
C. centriole
D. all of these

Answer

**Step-by-Step Solution:**

1. **Understanding Cytoplasmic Streaming**: Cytoplasmic streaming is the movement of the fluid substance (cytoplasm) within a plant or animal cell. This movement is crucial for distributing nutrients, organelles, and other materials throughout the cell.

2. **Identifying Microvilli Function**: Microvilli are tiny, finger-like projections on the surface of some cells, particularly in the intestines. They increase the surface area for absorption and are supported by a core of microfilaments.

3. **Analyzing the Options**:
- **Microtubules**: These are part of the cytoskeleton and are involved in maintaining cell shape, cell division (spindle fibers), and intracellular transport. However, they are not primarily responsible for cytoplasmic streaming or the function of microvilli.
- **Microfilaments**: These are also part of the cytoskeleton and are composed of actin. They play a crucial role in cell movement, shape changes, and are essential for the structure of microvilli. They facilitate cytoplasmic streaming by enabling the flow of cytoplasm.
- **Centrioles**: These are involved in cell division and the formation of spindle fibers but do not directly influence cytoplasmic streaming or microvilli function.

4. **Conclusion**: Based on the analysis, the correct answer is **microfilaments**. They are essential for both cytoplasmic streaming and the structural integrity and function of microvilli.

**Final Answer**: Microfilaments

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