Cells - Mitochondria

Mitochondria are essential organelles in cells, known for generating ATP through aerobic cellular respiration. They contain DNA and can self-replicate, suggesting an evolutionary origin from bacteria. Millions of years ago, a bacterial cell was engulfed by a eukaryotic ancestor, leading to the mitochondria's permanent role in eukaryotic cells.

What evidence suggests that mitochondria were once similar to bacteria?

Describe the significance of the engulfment of a bacterial cell by a eukaryotic ancestor.