Given that the cell is described as round and incapable of producing its own food, the appropriate organelle to assume the cell must have is the plasma membrane. The plasma membrane is essential for all cells as it regulates what enters and exits the cell, providing structure and protection.
The other options can be considered as follows:
- Central vacuole: More commonly found in plant cells, it is involved in storage and maintaining turgor pressure.
- Chloroplast: Responsible for photosynthesis, this organelle is typically found in plant cells and algae, which are capable of producing their own food.
- Cell wall: Also more common in plant cells, fungi, and some bacteria, it provides additional support and protection but is not present in all cell types, particularly animal cells.
Thus, the plasma membrane is the most fundamental organelle for all cells.
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