The bean-shaped organelle surrounded by two membranes is the mitochondrion.

Here's why:

* Shape: Mitochondria are often described as bean-shaped, although they can vary in shape depending on the cell type and its metabolic activity.

* Double Membrane: Mitochondria are unique in having two membranes:

* Outer membrane: Smooth and porous, allowing for the passage of small molecules.

* Inner membrane: Highly folded into cristae, increasing surface area for cellular respiration.

* Function: Mitochondria are the powerhouses of the cell, responsible for producing ATP (adenosine triphosphate), the primary energy currency of cells.

Let me know if you have any other questions!