Sphaerosomes have

Options

A. cellulose reserve
B. Protein reserve
C. Lipid reserve
D. Both protein and lipid reserve

Answer

### Step-by-Step Solution:

1. **Understanding Sphaerosomes**: Sphaerosomes are small cell organelles that are spherical in shape. They are also known as oleosomes due to their function related to fats.

2. **Origin**: Sphaerosomes arise from the endoplasmic reticulum, which is a key cellular organelle involved in the synthesis and storage of various biomolecules.

3. **Size**: These organelles are typically small, with sizes ranging from 0.5 to 1 micrometer in diameter.

4. **Function**: The primary function of sphaerosomes is to store and sometimes synthesize fats or lipids. This is their main role in the cell.

5. **Content**: Sphaerosomes contain granular content, primarily composed of lipids. While they may contain some proteins, the amount is minimal compared to the lipid content.

6. **Options Analysis**:
- **Cellulose reserve**: Incorrect, as cellulose is found in the cell wall, not in sphaerosomes.
- **Protein reserve**: Incorrect, as while proteins may be present, they are not the primary component.
- **Lipid reserve**: Correct, as sphaerosomes are primarily involved in lipid storage.
- **Both protein and lipid reserve**: Incorrect, since the lipid reserve is significant, but the protein content is negligible.

7. **Conclusion**: Based on the analysis, the correct answer is that sphaerosomes have a lipid reserve.