Mitochondria are organelles that are scattered throughout the cell, all cells have mitochondria. This is where chemical reactions occur that transfer energy from organic compounds to ATP. ATP is the molecule that most cells use as their main energy currency. ATP controls most of the reactions that occur inside of the cell. Which means that mitochondria is greater in numbers in cells that require more energy. Mitochondria is surrounded by two membranes. The smooth outer membrane which serves as a boundary between the mitochondria and the cytosol. And the inner membrane which had many folds called cristae. Cristae enlarges the surface of the mitochondria creating more space for chemical reactions to occur. Mitochondria have their very own DNA, and new mitochondria are born when existing ones grow and divide.
The Golgi apparatus or Golgi complex is a flattened, layered sac-like organelle that takes proteins and carbohydrates and modifies and packages them into membrane-bound vesicles. The Golgi apparatus is a system of membranes working in close association with the endoplasmic reticulum it modifies the proteins and carbohydrates for export by the cell.http://wiki.hicksvilleschools.org/groups/hsbiology/wiki/a67fa/images/4ca7d.jpg