Mitochondria are rod-shaped organelles bounded by a double membrane in which the inner membrane is folded and filled with matrix. Mitochondria is present in both plant and animal cells, and serves as the power house where respiration occur and energy is released from the oxidation of simple sugar.
This would mean a change in base sequence, which is very important for the proteins to carry out their function. It could lead to a mutation and a change in the role of the protein.
