organelle

2. A small organ-like structure within a cell that performs a specific function, such as energy production or protein building.

Mitochondria are organelles that turn food into energy for the cell.

3. Any of the specialized structures found in the cytoplasm of a eukaryotic cell, often enclosed by a membrane.

Scientists studied how organelles move around inside the cell.

4. A minute functional unit of a cell analogous to an organ in the body.

Each organelle has its own role, much like organs in the human body.