4b. Briefly describe the changes in gene expression that happen in the lac operon when lactose is present in the cell. Include changes in the action of RNA polymerase and the lac repressor protein.

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.