Which of the following is correct?

Options

A. Cells of all living organisms have a nucleus
B. Both animal and plant cells have a well defined cell wall
C. In prokaryotes, there are no membrane-bound organelles
D. Cells are formed de novo from abiotic materials

Answer

To determine which statement is correct, let's analyze each option step by step.

### Step 1: Analyze the First Option
**Statement:** Cells of all living organisms have a nucleus.

- **Explanation:** This statement is incorrect because not all living organisms have cells with a nucleus. Prokaryotic organisms, such as bacteria, are examples of cells that do not have a nucleus. They have genetic material that is not enclosed within a membrane-bound nucleus.

### Step 2: Analyze the Second Option
**Statement:** Both animal and plant cells have a well-defined cell wall.

- **Explanation:** This statement is also incorrect. While plant cells do have a cell wall made of cellulose, animal cells do not possess a cell wall. Instead, animal cells have a flexible plasma membrane.

### Step 3: Analyze the Third Option
**Statement:** Prokaryotes have no membrane-bound organelles.

- **Explanation:** This statement is correct. Prokaryotic cells, such as bacteria, lack membrane-bound organelles. They do not have structures like the endoplasmic reticulum, Golgi apparatus, or mitochondria, which are found in eukaryotic cells.

### Step 4: Analyze the Fourth Option
**Statement:** Cells are formed from abiotic material.

- **Explanation:** This statement is incorrect. Cells arise from pre-existing cells through the process of cell division (cell theory). They do not originate from abiotic (non-living) materials.

### Conclusion
After analyzing all options, the correct statement is:
- **Option 3:** Prokaryotes have no membrane-bound organelles.