Gastric cells secreting zymogen have well developed

Options

A. SER
B. RER
C. centrioles
D. mitochondria

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks which cellular structure is well-developed in gastric cells that secrete zymogen (inactive enzyme precursor). Zymogen is primarily pepsinogen, which is secreted by gastric cells.

2. **Identifying the Function of Gastric Cells:**
Gastric cells, particularly those that secrete zymogen, are responsible for producing digestive enzymes. These enzymes are proteins that facilitate the breakdown of food.

3. **Analyzing the Options:**
- **Option 1: Smooth Endoplasmic Reticulum (SER)** - This organelle is involved in lipid synthesis and detoxification but is not primarily responsible for protein synthesis.
- **Option 2: Rough Endoplasmic Reticulum (RER)** - This organelle is studded with ribosomes and is primarily involved in the synthesis of proteins, including digestive enzymes.
- **Option 3: Centrioles** - These are involved in cell division and do not play a role in enzyme secretion.
- **Option 4: Mitochondria** - These organelles are responsible for energy production but are not directly involved in the synthesis of proteins.

4. **Conclusion:**
Since gastric cells secrete zymogen, which is a protein, the organelle that would be well-developed in these cells is the Rough Endoplasmic Reticulum (RER). Therefore, the correct answer is **Option 2: RER**.

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