A unit membrane is absent over

Options

A. Lysosome
B. Microbody
C. Golgi apparatus
D. Ribosomes

Answer

To answer the question "A unit membrane is absent over," we will analyze each option provided and determine which cellular structure does not have a surrounding membrane.

### Step-by-Step Solution:

1. **Understand the term "unit membrane":**
- A unit membrane refers to a biological membrane that surrounds a cell or organelle. It is typically composed of a lipid bilayer.

2. **Evaluate the options:**
- **Option A: Lysosome**
- Lysosomes are known as the "suicidal bags" of the cell. They are surrounded by a single-layer membrane, which means they do have a unit membrane.

- **Option B: Microbodies**
- Microbodies, which include peroxisomes, are also surrounded by a membrane. Therefore, they do have a unit membrane.

- **Option C: Golgi Apparatus**
- The Golgi apparatus is another cellular organelle that is surrounded by a single-layer membrane. Thus, it also has a unit membrane.

- **Option D: Ribosomes**
- Ribosomes are known as the protein factories of the cell. Importantly, they are not surrounded by any membrane. Therefore, they do not have a unit membrane.

3. **Conclusion:**
- Based on the analysis, the correct answer is **Option D: Ribosomes**, as they are the only structure listed that lacks a surrounding membrane.

### Final Answer:
A unit membrane is absent over **ribosomes**.

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