Which one of the following has a single membrane?

Options

A. Nucleus
B. Ribosome
C. Sphaerosome
D. Mitochondria

Explanation

To determine which of the given options has a single membrane, we can analyze each option step by step:

### Step 1: Analyze the Nucleus
- The nucleus is known to have a double membrane structure. It consists of an outer membrane and an inner membrane, which encloses the genetic material (DNA).
- **Conclusion:** The nucleus does not have a single membrane.

### Step 2: Analyze the Ribosome
- Ribosomes are unique in that they are non-membrane-bound organelles. They do not possess any membrane at all.
- **Conclusion:** Ribosomes do not have a single membrane.

### Step 3: Analyze the Mitochondria
- Mitochondria are also characterized by having a double membrane structure. They have an outer membrane and an inner membrane, which is involved in energy production.
- **Conclusion:** Mitochondria do not have a single membrane.

### Step 4: Analyze the Spherosome
- Spherosomes are known as the "lysosomes of plant cells." They have a single membrane surrounding them. They contain hydrolytic enzymes and are involved in lipid synthesis and storage.
- **Conclusion:** Spherosomes have a single membrane.

### Final Answer
Based on the analysis, the option that has a single membrane is **spherosomes**.

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