In animal cells steroidal hormones are synthesised by

Options

A. Glyoxysomes
B. Peroxisomes
C. SER
D. RER

Answer

To answer the question "In animal cells, steroidal hormones are synthesized by," we can analyze the options provided step by step.

### Step-by-Step Solution:

1. **Understanding the Options**: The options given are Glyoxyzone, Paroxyzone, Smooth Endoplasmic Reticulum (SER), and Rough Endoplasmic Reticulum (RER). We need to determine which of these is responsible for synthesizing steroidal hormones in animal cells.

2. **Analyzing Glyoxyzone**:
- Glyoxyzone is an organelle that is not found in animal cells; it is present in plant cells and certain fungi.
- Its primary function is related to fatty acid metabolism in germinating seeds.
- **Conclusion**: Glyoxyzone is not involved in the synthesis of steroidal hormones in animal cells. This option is incorrect.

3. **Analyzing Paroxyzone**:
- Paroxyzone (likely referring to Peroxisomes) is present in all eukaryotic cells.
- Its functions include the oxidation of fatty acids and detoxification of reactive oxygen species.
- However, it does not play a role in lipid biosynthesis or the synthesis of steroid hormones.
- **Conclusion**: Paroxyzone is not responsible for synthesizing steroidal hormones. This option is also incorrect.

4. **Analyzing Smooth Endoplasmic Reticulum (SER)**:
- The Smooth Endoplasmic Reticulum is characterized by the absence of ribosomes, giving it a smooth appearance.
- It is involved in lipid biosynthesis, including the synthesis of steroid hormones from cholesterol.
- **Conclusion**: The SER is indeed responsible for the synthesis of steroidal hormones in animal cells. This option is correct.

5. **Analyzing Rough Endoplasmic Reticulum (RER)**:
- The Rough Endoplasmic Reticulum has ribosomes attached to its surface, which gives it a rough appearance.
- Its primary function is protein synthesis, not lipid or steroid hormone synthesis.
- **Conclusion**: The RER does not synthesize steroidal hormones. This option is incorrect.

### Final Answer:
The correct answer is **Smooth Endoplasmic Reticulum (SER)**.

---