Lipo-protein network of tubular structures scattered in the cytoplasm of eukaryotic cell is

Options

A. Cytoskeleton
B. Microtubules
C. Endoplasmic reticulum
D. Plastids

Answer

To solve the question regarding the lipo-protein network of tubular structures scattered in the cytoplasm of a eukaryotic cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a structure in eukaryotic cells that is a network of tubular structures and is made up of lipoproteins.

2. **Analyzing the Options**:
- **Cytoskeleton**: This is composed of microtubules, actin filaments, and intermediate filaments. It provides structural support to the cell but is not made of lipoproteins.
- **Microtubules**: These are a component of the cytoskeleton and are made of the protein tubulin, not lipoproteins.
- **Endoplasmic Reticulum (ER)**: The ER is a network of membranous tubules and sacs (cisternae) and is involved in protein and lipid synthesis. It is indeed made up of lipoproteins and has a tubular structure.
- **Plastids**: These are organelles found in plant cells, involved in photosynthesis and storage. They are made of special lipids called galactolipids, not lipoproteins.

3. **Identifying the Correct Answer**: Among the options, the only structure that fits the description of being a lipoprotein network of tubular structures is the **Endoplasmic Reticulum**.

4. **Conclusion**: Therefore, the correct answer to the question is **Endoplasmic Reticulum**.

### Final Answer:
**Endoplasmic Reticulum** (Option 3)

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