Answer:

1.) Outer Membrane, Intermembrane space, Inner membrane, Cristae, Matrix.

2.) • Outer membrane- Small molecules can pass freely through the outer membrane. This outer portion includes proteins called porins, which form channels that allow proteins to cross. The outer membrane also hosts a number of enzymes with a wide variety of functions.

• Intermembrane space- This is the area between the inner and outer membranes

• Inner membrane- This membrane holds proteins that have several roles. Because there are no porins in the inner membrane, it is impermeable to most molecules. Molecules can only cross the inner membrane in special membrane transporters. The inner membrane is where most ATP is created.

• Cristae- These are the folds of the inner membrane. They increase the surface area of the membrane, therefore increasing the space available for chemical reactions.

• Matrix- This is the space within the inner membrane. Containing hundreds of enzymes, it is important in the production of ATP. Mitochondrial DNA is housed here (see below).

3.) Mitochondria are known as the powerhouse of the cell because it is responsible for the extracting energy from food through cellular respiration. ... The energy is released in the form of adenosine triphosphate (ATP) it is an energy currency of the cell.