1. Mitochondria: These are the powerhouses of the cell, responsible for generating energy through cellular respiration. They have their own DNA (mtDNA) and replicate independently from the cell's nucleus.

2. Chloroplasts: These organelles are found in plant cells and are responsible for photosynthesis, the process of converting light energy into chemical energy. Like mitochondria, they have their own DNA (cpDNA) and replicate independently.